Abstract: A novelty device includes a power source, lighting elements and a flashing circuit to selectively provide lighting signals to the lighting elements. The novelty device further includes a spring switch to activate the flashing circuit. The spring switch includes a spring having a fixed end and a free end and a metal cap positioned proximate the free end of the spring for electrical engagement by the free end of the spring. Examples of the novelty device include a pen, a key chain, a hair clip and a cosmetics case.

Abstract: A pen with both music and motion lighting function but capable of emitting multiple color light source variably accompanying the cadence or rhythm of pleasant played music for fascination, enjoyment and amusement of individual's sight and hearing. A music-light generating means disclosed is fitted into a tubular cylindrical holder invented as a sound box to have sounds generated from the music-light generating means resonate to enhance hearing and overall sound output.

Abstract: A ball pen including a light emitting device is provided. In the ball pen, a light emitting diode (LED) is enclosed in a figurine attached to the end of the ball pen and two electric wires are connected to the LED. One of the wires is connected to one electrode of a battery and the other is in contact with a cone-shaped spring positioned at the lower portion of the battery. The cone of the cone-shaped spring is pushed up by an ink cartridge, making the cone-shaped spring come into contact with one electrode of the battery, so that an electric current flows through a circuit including the battery and the LED, thereby illuminating the LED. A stick is firmly engaged with the push button member and thus, the push button member is pushed to make inclined surfaces of a cylinder-rotation sawtooth and an inclined protruding stopper, which are formed in a rotational cylinder, glide along the inclined surfaces of the cylinder-rotation side protrusions, thereby rotating the rotational cylinder.

Abstract: An ultraviolet light emitting diode flashlight is contained within a housing having a pen tip extending from the housing and an ink or dye reservoir in fluid communication with the pen tip. The ultraviolet light emitting diode flashlight within the housing emits light capable of inducing fluorescence in the ink or dye. A switch assembly completes an electrical circuit between a light emitting diode and a battery to activate the flashlight. A writing system package includes at least two of: a neon or pastel colored writing surface, a security pen having an ink or dye that fluoresces in the visible portion of the light spectrum upon exposure to ultraviolet light, and an ultraviolet light emitting diode flashlight.

Abstract: In a pen holder comprising an emitter for emitting at least one of light beam and supersonic waves to be detected by a sensor so that a signal corresponding to a position of the pen holder is generated by the sensor on the basis of the detected at least one of light beam and supersonic waves, a pen holder including an opening which is arranged at a longitudinal end of the pen holder in such a manner that a front portion of the pen including an end at which end the visible line is drawn on the board projects from the opening out of the pen holder, and through which a part of the pen other than the front portion of the pen is mountable from an outside of the pen holder onto the pen holder so that the pen is held on the pen holder.

Abstract: A combination stylus and laser pointer for use in connection with a personal digital assistant (PDA), the combination having a thin slimline housing enabling the apparatus to be stored in a groove or channel located on the PDA. A laser module assembly for generating a laser beam is secured within the housing on one end thereof. The device further includes an interchangeable stylus and pen tip that is secured within the housing at the opposite end thereof.

Abstract: A touch pen includes a pen barrel having opposite first and second barrel portions. An illuminating unit is received in the first barrel portion, and includes a switch connected to a light source and a power source and operable so as to establish electrical connection between the light source and the power source for enabling the light source to generate a light output which radiates out of the pen barrel via an open end of the first barrel portion. A transparent pen cap has a mounting end portion sleeved removably on the first barrel portion, and a touch tip opposite to the mounting end portion and adapted for touching a touch control panel of a computerized apparatus.

Abstract: A ball pen including a light emitting device is provided. In the ball pen, a light emitting diode (LED) is enclosed in a figurine attached to the end of the ball pen and two electric wires are connected to the LED. One of the wires is connected to one electrode of a battery and the other is in contact with a cone-shaped spring positioned at the lower portion of the battery. The cone of the cone-shaped spring is pushed up by an ink cartridge, making the cone-shaped spring come into contact with one electrode of the battery, so that an electric current flows through a circuit including the battery and the LED, thereby illuminating the LED. A stick is firmly engaged with the push button member and thus, the push button member is pushed to make inclined surfaces of a cylinder-rotation sawtooth and an inclined protruding stopper, which are formed in a rotational cylinder, glide along the inclined surfaces of the cylinder-rotation side protrusions, thereby rotating the rotational cylinder.

Abstract: An illuminating device includes a casing having a movable module movably received therein. A first spring is biased between a first end of the movable module and an inside of the close end of the casing. An illuminating member is connected to a second end of the movable module and located in the open end of the casing. A circuit board is connected to the illuminating member and a second spring is biased between the circuit board and a plurality of batteries. A switch device is connected to the batteries and has a button extending from the first end of the movable module. When pushing the second end of the movable module, the button is compressed by the inside of the casing to turn on the illuminating member.

Abstract: The present invention relates to a portable apparatus including a fastening mechanism for use with the light-emitting disk. The clamping area of the light-emitting disk has a plurality of conductive terminals, and the touch portion of the fastening mechanism connected with the conductive terminals can supply electrical power to light up the light-emitting disk. Furthermore, the light-emitting disk can light partially, intermittently or colorfully by itself because the fastening mechanism controls the electrical power in different modes.

Abstract: An illuminating device includes a casing having a movable module movably received therein. A first spring is biased between a first end of the movable module and an inside of the close end of the casing. An illuminating member is connected to a second end of the movable module and located in the open end of the casing. A circuit board is connected to the illuminating member and a second spring is biased between the circuit board and a plurality of batteries. A switch device is connected to the batteries and has a button extending from the first end of the movable module. When pushing the second end of the movable module, the button is compressed by the inside of the casing to turn on the illuminating member.

Abstract: The present invention relates to a portable apparatus for use with the light-emitting disk. The inner-circle plastic sheet of the light-emitting disk has a plurality of conductive terminals, and the touch portion of a fastening mechanism is used to transfer the power source to the conductive terminals to excite the light-emitting disk to luminesce. The light-emitting disk can be held by users with a fastening mechanism, hung on the chest of a user or placed on a table. Besides, the sponsor of a party, a singing show or a pub can previously record the singer's song on a light-emitting disk, combine the light-emitting disk into a portable apparatus by the teaching of the present invention, and give as a present to viewers or draw lots to determine the prize winners for increasing a scene atmosphere or for advertising effect.

Abstract: A touch-controlled lighting circuit assembly includes a holder shell having a top open chamber, a bottom open chamber and a through hole between the top open chamber and the bottom open chamber, a battery set installed in the bottom open chamber, and a light-emitting element installed in the top open chamber with a first lead-out wire inserted through the through hole of the holder shell and maintained in contact with the negative terminal of the battery set and a second lead-out wire extended out of the holder shell and suspended below the bottom open chamber and adapted to touch the positive terminal of the battery set for causing the light-emitting element to emit light when vertically pressed against the bottom open chamber of the holder shell.

Abstract: A light-emitting pen is formed by a front pen tube, a rear pen tube and a middle ring. A metal cap at a lower end of a resisting element in the rear pen tube is in contact with or not in contact with the metal button at a top end of the light-emitting element and a metal conductive wire at the same time. Then a light-emitting body emits light or does not emit light or a filler will move upwards or downwards. Moreover, the light-emitting body and the filler can be controlled in four different stages.

Abstract: A pen light bulb which is self aligning in conventional pen light flashlights is disclosed. Applicable pen light flashlights rely upon pressure bearing retention of the bulb therein. A focusing lens protective element of the pen light bulb has various features which provide for a more stable seating surface thereon to contact the housing of the pen light flashlight. These features provide for the axis of projection of the beam of light from the bulb to match, or nearly match, a central axis of the pen light flashlight. A wider and larger spring contact surface on a circular base of the housing of the pen light bulb provides for a truer application of pressure by a spring to the pen light bulb to assist in proper alignment within conventional pen light flashlights.

Abstract: A lateral animation display sequentially illuminates individual images of an animated sequence. The display may be carried on a useful article, such as an item of wearing apparel or the like. An array of light sources illuminates a corresponding array of image frames depicting a stop-action sequence, such as stop-action images of a person running. An optional array of baffles confines light from each of the light sources to a corresponding one of the image frames. The individual light sources are sequentially activated so as to sequentially illuminate the corresponding image frames and thereby present an animated display of the stop-action sequence. A semi-transparent layer over the image frames obscures the images except when illuminated by the corresponding light source.

Abstract: A pen light includes a barrel and a cap attached to the barrel, and cartridge being arranged within the barrel. The barrel is made from transparent material and is provided with connecting portions at both ends thereof for engagement with the cap. A lighting assembly is arranged in the cap and includes a lighting device being arranged within the cap and which is powered by a battery disposed within the cap. A switch is arranged on the cap for controlling On/Off of the lighting device, wherein the lighting device is arranged to an end of the cap. The cap can be used individually as a flashlight or together with the barrel thereby providing aesthetic appearance of the barrel.

Abstract: This invention of double-tube water pen includes an outer tube, an inner tube, an ink tube, a pen cover, and a pen top. Once the inner and outer tubes are connected, decorative liquid can be added. The closed end of the inner tube can have an extended tube. This extended tube can take in ink tube in its outer tube and make the length of ink tube to be longer. Moreover, a glowing gadget can be installed into the empty space inside of inner tube. One end of the glowing gadget is pushed closely to the end of the ink tube. When users use the pen and press the ink tube to the glowing gadget, the glowing part inside of the gadget will receive current and start to glow. This will add special effect to the pen.

Abstract: A laser pen includes a metallic barrel, a laser device mounted in the upper portion of the metallic barrel, a safety power cutoff device having an insulating tube secured in the lower portion of the metallic barrel, a plurality of batteries received in the upper portion of the insulating tube and electrically connecting to the laser device, a reservoir tube having a top portion including a metallic contact head movably mounted in the lower portion of the insulating tube and detachably contacting one of the batteries, and a rotating device mounted on the lower portion of the metallic barrel and engaged with the metallic contact head of the reservoir tube for moving the metallic contact head.

Abstract: An illuminable accessory item having an illuminating unit included within the structure of the accessory item so that the illuminating unit is illuminated upon exertion of pressure on a specific trigger point on the accessory item. A pressure-activated actuator that controls the illumination of the illuminating unit is activated when pressure is applied to the trigger point. The actuator comprises a circuit board that, in combination with the illuminating unit, a trigger and one or more power sources, forms a closed circuit that delivers electrical current to the illuminating unit. One or more embodiments of the invention further include an ornamental fixture that is preferably transparent or translucent and can be used as a cover for the illuminating unit. When the illuminating unit is lit, its illumination is visible through the transparent or translucent portions of the ornamental fixture.

Abstract: This invention of double-tube water pen includes an outer tube, an inner tube, an ink tube, a pen cover, and a pen top. Once the inner and outer tubes are connected, decorative liquid can be added. The closed end of the inner tube can have an extended tube. This extended tube can take in ink tube in its outer tube and make the length of ink tube to be longer. Moreover, a glowing gadget can be installed into the empty space inside of inner tube. One end of the glowing gadget is pushed closely to the end of the ink tube. When users use the pen and press the ink tube to the glowing gadget, the glowing part inside of the gadget will receive current and start to glow. This will add special effect to the pen.

Abstract: A combination stylus and laser pointer for use in connection with a personal digital assistant (PDA), the combination having a thin slimline housing enabling the apparatus to be stored in a groove or channel located on the PDA. A laser module assembly for generating a laser beam is secured within the housing on one end thereof. The device further includes an interchangeable stylus and pen tip that is secured within the housing at the opposite end thereof.

Abstract: A pen or pencil having a shaft which in its peripheral surface has at least one first and at least one second surface region. Irradiation of the first surface region with light of a first light quantity per unit of surface area results in an emission of visible light in the second surface region, wherein the light quantity emitted in the second surface region per unit of surface area for at least one first frequency is greater than the light quantity per unit of surface area of the first frequency, which is absorbed in the first surface region.

Abstract: A flashlight comprises an electrically-conductive cylindrical housing having a reduced inner diameter portion, for example, a tapered portion, and a hole at a forward end thereof with a solid state light source projecting through the hole at the forward end thereof and a tail cap attached to the housing at a rearward end thereof. A switch in the tail cap selectively connects the solid state light source and at least one battery in the housing in circuit through the housing for causing the solid state light source to produce light. The light source makes electrical contact with the housing at a contact area at which an insulating coating has been removed. The housing of the flashlight is formed by forming a reduced inner diameter portion in a cylindrical housing tube having an insulating coating and removing the insulating coating from the inner surface of the reduced inner diameter portion of the housing to provide the contact area.

Abstract: A flash type optic pen comprises a pen body, a seat and a transparent telescopic head. The pen body is electrically connected to a battery and a switch. The seat is assembled to the front end of the pen body and has at least one circuit board and a plurality of light emitting diodes electrically connected to the circuit board. The transparent telescopic head is formed by a plurality of transparent staged tubes having reducing diameters. Thus, the pen body has the functions of writing and illumination. The light emitting angles, colors, heights and orientations of the light emitting diodes are different. The circuit board is installed with a programmable IC circuit for presetting and controlling the lighting up and extinguishing order of the light emitting diodes. The lights from the light emitting diodes are alternatively changed in a predetermined way or randomly, or flashes overlapped or separately.

Abstract: In a pen holder comprising an emitter for emitting at least one of light beam and supersonic waves to be detected by a sensor so that a signal corresponding to a position of the pen holder is generated by the sensor on the basis of the detected at least one of light beam and supersonic waves, a pen holder including an opening which is arranged at a longitudinal end of the pen holder in such a manner that a front portion of the pen including an end at which end the visible line is drawn on the board projects from the opening out of the pen holder, and through which a part of the pen other than the front portion of the pen is mountable from an outside of the pen holder onto the pen holder so that the pen is held on the pen holder.

Abstract: A new and improved writing apparatus is disclosed that will assist a user in using a writing utensil while it is dark or there is insufficient light. The present invention would comprise a writing utensil and an attached flashlight. The writing utensil would preferably be a pen, but a pencil could also be utilized. The writing utensil would have two ends, a writing end and a terminal end. The flashlight would be located in a thin tube which would have two ends, a first end and a second end. The first end of the thin tube of the flashlight would be located near the writing end of the writing utensil and would have a light attached. The second end of the thin tube of the flashlight would be located near the terminal end of the writing utensil and would have an on/off push button switch. The flashlight would be powered by an internal battery which would be located in either the writing utensil or the thin tube.

Abstract: The invention relates to an implement holder, in particular for a pocket knife, or a flat-design storage case having a housing body with one or more housing compartments for at least one implement which can be moved out from a rest position into a position of use, e.g. a knife, corkscrew, screwdriver. A writing instrument is provided as an implement and the housing body projects beyond the implement forming the handle thereof in a ready-to-use position.

Abstract: A hand held device providing effective illumination of a site being worked on has a metal tube serving as a handle, at one end of which a switch is threaded therein, and at the other end of which a window is secured. Located within the handle are a battery, which communicates with the switch by means of a spring, and a light bulb, which faces the window. Interchangeable implements, including tools and instruments, are individually releasably secured within an orifice in the window. The switch operates simply, facilely, and positively, with no parts which will wear out.

Abstract: An advertise effect photo pen includes a front tube, a connecting seat and a rear tube. The rear end of the front tube is installed with an outer thread, in assembling, the outer thread is screwed into an inner thread of the connecting tube. The rear end of the connecting seat is installed with an outer thread, in assembling, the rear end of the connecting seat is screwed into an inner thread of the rear tube. Therefore, the rear tube is connected to the front tube by the connecting seat. The front tube is a hollow transparent material and a refill is connected at a front end. The surface of the connecting seat is a hollow transparent material. After processed by web printing, the surface is formed with a transparent surface and a shielding surface; and the shielding surface or the transparent surface has advertise patterns. The light emitting unit is a single color or a multiple color element.

Abstract: A writing instrument with sound and illumination functions has a case with an ink cartridge. A chamber is mounted on the case. A buzzer and an IC board are installed in the chamber. The IC board has an LED mounted on the upper surface and two battery seats with a battery in each seat mounted on the bottom surface. When writing, the circuit consisting of the buzzer, the LED, the IC board and the batteries is completed so that the LED emits light and the buzzer makes a sound or plays music.

Abstract: A combination light pen, which includes an upper barrel, a pen cap and a connector fastened to top and bottom ends of the upper barrel, a LED and battery circuit assembly mounted in the upper barrel, a push-button switch mounted in the pen cap and operated to turn on/off the LED, a transparent lower barrel fastened to the connector to hold an ink cartridge and a transparent conical socket, wherein the lower barrel comprises a water chamber disposed around the ink cartridge, a liquid filled in the water chamber, and display items floating in the liquid inside the water chamber.

Abstract: A photo-pen with the function of displaying a phone calling and illumination in dark comprises a pen head, a pen body, and an inducing light emitter. The pen head has an inner pen tube. The pen body is installed at a distal end of the pen head, have a battery therein and having a transparent portion. The inducing light emitter is received within the pen body and has an inducing circuit board electrically connected to the battery and is controlled by a switch key. The inducing circuit board is installed with at least one first light emitter and at least one second light emitter. The first light emitter is placed at the distal end of the pen body and is covered by the distal cover; and the second light emitter is placed at the second section tube.

Abstract: An optic pen including an end cap with a light source arranged at a front end thereof; a pen tube, secured to the front end of the end cap, for holding a wick; and a lens arranged in a rear end of the pen tube for focusing a ring of light around the wick.

Abstract: A writing implement having a built-in illumination system includes a pen-top, a translucent pen-body, and a translucent pen-tip. A battery, an electrical switch and a lamp are housed within the pen-top so that light may be selectively generated by the lamp and directed generally along a central axis within the pen-body portion towards the pen-tip. A marking element is located within said pen-body, partially extending from said pen-tip. A lens is positioned between said lamp and said marking element so that light from the lamp is diverted away from the central axis to the pen-body which guides the received light to the pen-tip. Printed information located on the pen-body is illuminated, as well as a region located immediately adjacent to the pen-tip.

Abstract: An illuminating ball-point pen includes an elongated tubular holder, a hollow protective member fitted on an upper end of the elongated tubular holder, a battery mounting arranged inside the protective seat, batteries fitted inside the battery mounting and electrically connected in series, a seat mounted in a top of the battery mounting, a metal stopper mounted under the battery mounting and having a bottom provided with a flange, a spring enclosing the battery mounting and the metal stopper and having an upper end bearing against the battery mounting and a lower end bearing against the flange of the metal stopper, a light bulb disposed on the seat and having a leg extending downwardly through the seat to contact an electrode of the batteries and another leg extending downwardly between the battery mounting and the spring, a transparent hood engageable with an upper end of the hollow protective member, and a reservoir tube fitted inside the elongated tubular holder and having an upper end bearing against a bo

Abstract: An Improved method of marking locations and obstacles in low light situations comprised of an LED, with an integral resistor to allow it to be powered from a 9 vdc source, that is connected, via the anode and the cathode, to a pair of battery terminals. These terminals allow it to be attached to a conventional 9 volt battery. The terminals are affixed to a base that the LED sits upon. The base is covered with a cap that prevents any movement of the LED.

Abstract: A pointing device includes a casing having a lens received in the first end thereof and a battery received in the second end thereof. A motor is received in the casing and has a shaft to which a transparent disk is co-rotatably mounted, a plurality of pictures imprinted on the transparent disk. A control device for actuating the motor is received in the casing and connected to a button on the casing. A laser beam generating device is located between the control device and the transparent disk, and aligns with the pictures when the transparent disk is co-rotated with the shaft so as to project a motion picture on a remote wall.

Abstract: A pen or the like with dual illuminating ends includes a light transmitting case, a protective seat connected to the top end of the light transmitting case, a top illuminating module mounted within the protective seat, a light transmitting moveable seat mounted at the bottom of the protective seat, a bottom illuminating module mounted within the light transmitting moveable seat, a refill mounted within the light transmitting case and urged against the moveable seat, both the structures of the top and bottom illuminating module are similar and are mounted asymmetrically. The top and bottom illuminating module includes light emitting diode, a light emitting seat, a battery, a battery seat, a metallic spring, and a metallic blocking nut to form circuit in parallel.

Abstract: An illuminating ball pen includes an ink cartridge received in a barrel, a joint pipe threadly engaged on a top end of the barrel, a top seat which is easily connected/disconnected with an upper end of the joint pipe, a lighting assembly provided in the top seat and with a lighting element protruded into a transparent globe a the top of the top seat, and a stamping seat secured in a lower end of the top seat. The lighting element of the ball pen will light or flash when a user is writing or stamping with the ball pen, or shaking the ball pen up and down.

Abstract: A light pen with multicolor light sources comprise a pen holder and a pen body wherein the pen body which slips on the pen holder can generate multicolor light sources, and the pen body further comprises a multicolor Light Emitting Diode (LED), a housing, and a conductive stand wherein the LED and the conductive stand are installed respectively at both ends of the housing. By turning the knob on the conductive stand, the conductive piece therein timely contacts the positive leads of different chips of LED in order to make the multicolor LED timely generate multicolor light sources to facilitate the convenient usage of light pen.

Abstract: An illuminated centerpunch designed to illuminate the area on a workpiece where a punch mark is to be made. The centerpunch includes a hollow, cylindrical-shaped main body. Attached to the proximal end of the main body is a replaceable striking cap. Disposed inside the main body is a bulb holding collar acts as a switch and which holds a plurality of bulbs. Attached to the distal end of the main body is a post assembly designed to hold a replaceable tip and the bulb holding collar inside the main body. Attached over the distal end of the main body and around the replaceable tip is an optical end assembly. The optical end assembly includes a ring plate with a plurality of radially, spaced-apart arms which extend distally and curve inward from the main body. Located inside each arm is a fiberoptic capable of transmitting light produced by the bulbs located inside the main body to a desired point on the work surface. Disposed inside the main body are batteries electrically connected to the bulbs.

Abstract: A writing instrument pocket clip light for providing a light from a writing instrument on to a writing surface. The writing instrument pocket clip light includes an elongate clip portion designed for attachment to a writing instrument. An elongate stem is pivotally coupled to the clip portion. A light base is coupled to the stem. The light base has a depression therein. A cover lens covers the depression of the light base. A battery is disposed in the depression of the light source. A light source is mounted to the cover lens and disposed between the cover lens and the light base. The light source is electrically connected to the battery.

Abstract: A laser pointer includes a first metal barrel having a first end closed with a metal screw cap, and a second end, which is opened, the first metal barrel holding a battery set, a control circuit board, an axially extended spring member and a laser diode supported on the axially extended spring member and extended out of the second end of the first metal barrel; a second metal barrel having a first end opened and coupled to the second end of the first metal barrel by a screw joint, and a second end opened, the second metal barrel being moved axially relative to the first metal barrel upon a rotary motion; and a socket mounted in the first end of the second metal barrel and moved with the second metal barrel axially between a first position where the socket is coupled to the laser diode to compress the axially extended spring member and hold the laser diode in position, and a second position where the socket is released from the laser diode, enabling the laser diode to be oscillated with the axially extended sp

Abstract: An adjustable, self-illuminating, writing instrument is provided having a main shaft terminating at one end in a pen and at the other end with a flexible shaft supporting a directable illumination source. An on/off switch is provided which also serves as a diameter adjustment mechanism for the beam created by the illumination source.

Abstract: A pen-base laser pointer includes a metal barrel, a laser firing cap and a metal bottom cap fastened to front and rear ends of the metal barrel, a laser module and battery cells mounted inside the metal barrel, and an on/off button controlled to close/open the circuit of the laser module, wherein the laser module has a metal contact spring plate disposed in contact with the inside wall of the metal barrel, the metal contact spring plate having a plurality of radial projecting portions equiangularly spaced around the border thereof, which are deformed and pressed against the inside wall of the metal barrel to hold down the laser module in place when the laser module is inserted into the metal barrel.

Abstract: A laser pointer having a laser generating loop formed of a metal barrel, a metal clip, a metal rear end cap, a series of battery cells, a laser generating unit and a signal line, and controlled by an electronic switch to emit a laser beam, the electronic switch being switched on when the user holds the metal rear end cap in hand and touching the metal clip with one finger, the electronic switch being switched off when the finger is removed from the metal clip.

Abstract: A light pen comprises a barrel defining a chamber therein, a cap detachably mounted on the upper end of the barrel having a cavity defined therein, a luminous bar disposed in the cavity of the cap and received in the chamber of the barrel. The luminous bar can be reversed on the barrel to provide a warning.

Abstract: A ball point pen having a pocket clip with a light source located within the clip. A self contained battery power source located in the pen's body is electrically connected to the light source through a button switch. Activation or deactivation of the button switch and its circuit for the light source is accomplished by depressing a rear mounted external button on the pen.

Abstract: A light beam leveling device and method utilizable particularly in hemodynamic cardiac monitoring of patients in which a pressure transducer is required to be leveled with the tip of a catheter placed at the heart of a patient. The light beam device, preferably a laser, is placed at the transducer and is raised and lowered therewith relative to a reference point on the patient corresponding to the level of the tip of the catheter. When the laser beam is projected horizontally as established with associated bubble level means and is directed so as to cause a reflection directly at the reference point, the transducer is assured thereby to be at the level of the catheter tip in the patient. A transparent cylindrical bar at the tip of the laser through which the laser beam passes causes a line of light to be projected at right angles to the orientation of the bar. An associated protractor permits selection of the desired angle of orientation of the line of light projected from the laser.