Abstract: The disclosed instrument includes not only a compass, but also a laser for the emission of a laser beam arranged to define, together with the laser beam, a direction to a point at a distance from the instrument. The compass housing and the laser are mounted in an instrument housing such that the laser is arranged to emit a laser beam parallel to the direction in which the compass is pointing. The compass housing is a separate unit that can be ejected from and inserted into a cavity in the instrument housing from one of its ends. Opposing grooves are arranged in the cavity in order to position the compass housing in the instrument housing. A lock arrangement is present to lock the compass housing fixed in the instrument housing.

Abstract: A measurement arrangement has a rotation axis around a first end of an extended member having a first joint thereat, and a second joint at the opposing end. An equipment for recording measured points is connected to the second joint. The joints are connected through a cord or wire. The equipment is arranged to rotate through a pre-determined angle when the member is turned around its rotation axis. An angle sensor records the rotation of the equipment relative to the member. The cord or wire rotates the equipment through an angle corresponding to the angle that the member has rotated around its rotation axis. The equipment and the member rotate in opposite directions, and the angles of rotation are recorded when the equipment detects the limiting surface of the object on both sides of the diameter to be measured. A processor calculates the diameter based on the angles of rotation.

Abstract: A diameter measuring instrument that comprises a straight-edge and two legs or jaws, wherewith the distance between the legs can be read-off. The invention is characterized in that the straightedge (2) is provided with a leg (3) which is fixed in relation to the straightedge and a leg (4) which is movable relative to the straightedge, or alternatively with two legs that are movable relative to the straightedge; in that each leg (3, 4) includes a laser (5, 6) which is designed to emit a visible laser beam (7, 8) in a direction that coincides with the length direction of respective legs (3, 4); and in that the laser beams (7, 8) are parallel to one another.

Abstract: A measurement arrangement has a rotation axis around a first end of an extended member having a first joint thereat, and a second joint at the opposing end. An equipment for recording measured points is connected to the second joint. The joints are connected through a cord or wire. The equipment is arranged to rotate through a pre-determined angle when the member is turned around its rotation axis. An angle sensor records the rotation of the equipment relative to the member. The cord or wire rotates the equipment through an angle corresponding to the angle that the member has rotated around its rotation axis. The equipment and the member rotate in opposite directions, and the angles of rotation are recorded when the equipment detects the limiting surface of the object on both sides of the diameter to be measured. A processor calculates the diameter based on the angles of rotation.

Abstract: A caliper-like instrument for measuring tree diameters, includes a straightedge on which there is placed a first leg and a second leg. The instrument further includes a recording unit adjacent the first leg for recording and storing tree diameter measurements. The first leg is fixedly placed along the straightedge, and the second leg projects out from a slide displaceable along the straightedge, with the legs and the straightedge located in mutually the same plane. The first leg can be lowered in the plane and is pivotally fastened to an attachment on the straightedge, and the second leg can be lowered in the plane and is pivotally attached to the slide. The first leg has a first fastener intended to be hooked into the attachment and the second leg has a second fastener intended to be hooked into the slide.

Abstract: An electronic measuring tape that includes a roller onto which the measuring tape is arranged to be wound up onto and wound out from through the roller being rotated, a first end of the measuring tape is attached in the roller, and where the roller is located inside a housing. A rolled up measuring tape is arranged in loops on the roller. All loops are in direct contact with the surface of the roller, an angle sensor is arranged at the roller to record an angle of rotation during rotation of the roller. An electronic circuit converts the angle of rotation into a length that corresponds to the length by which the measuring tape has been withdrawn from the housing, and the measuring tape records absolute values.

Abstract: A calliper-like instrument for measuring tree diameters, includes a straightedge on which there is placed a first leg and a second leg. The instrument further includes a recording unit adjacent the first leg for recording and storing tree diameter measurements. The first leg is fixedly placed along the straightedge, and the second leg projects out from a slide displaceable along the straightedge, with the legs and the straightedge located in mutually the same plane. The first leg can be lowered in the plane and is pivotally fastened to an attachment on the straightedge, and the second leg can be lowered in the plane and is pivotally attached to the slide. The first leg has a first fastener intended to be hooked into the attachment and the second leg has a second fastener intended to be hooked into the slide.

Abstract: An electronic measuring tape (11) that comprises a roller (8) onto which the measuring tape (12) is arranged to be wound up onto and wound out from through the roller (8) being rotated, a first end (3) of the measuring tape (12) is attached in the roller (8), and where the roller (8) is located inside a housing (9a, 9b). The invention is characterised in that a rolled up measuring tape (12) is arranged in loops on the roller (8), of which all loops are in direct contact with the surface (1) of the roller (8), in that an angle sensor (6) is arranged at the roller (8) arranged to record an angle of rotation during the rotation of the roller (8), and in that an electronic circuit (15) is arranged to convert the said angle of rotation into a length that corresponds to the length by which the measuring tape (12) has been withdrawn from the said housing (9a, 9b), and in that the measuring tape (12) records absolute values.

Abstract: A caliper for measuring tree diameters of trees. A slide having a permanent magnet is movable along a graduated rule, the caliper including a pair of legs, one leg attached to one end of the rule, and another leg attached to the slide. An electronic unit measures the position of the slide along the rule and stores measurement values and other desired data. A wire extends within a longitudinal internal cavity in the rule and co-acts with a piezo crystal adjacent an end of the caliper. The wire is connected to a pulse generator that generates short electric pulses of predetermined duration. The caliper also includes a detector that co-acts with the piezo crystal and with the pulse generator pulses to detect a geometric change in the wire that is sensed by the piezo crystal, which emits an electrical pulse in response to that geometric change.