Abstract: The retractable test probe includes a main sleeve, a needle and a rotation positioning mechanism. The needle is rooted in the main sleeve. The rotation positioning mechanism includes an eccentric incoaxially fastened to the needle and a flexible sleeve around the eccentric and in the main sleeve. When the needle is turned towards a specific direction, the eccentric will be firmly fastened in the main sleeve through the flexible sleeve, when the needle is turned reversely, the eccentric will be released from the flexible sleeve to be retractably movable.

Abstract: A clamp meter has a main body and a stationary jaw fixed to an end of the main body. A hook portion of the clamp meter includes a movable jaw, a displacing means and a knob. The movable jaw is mounted on the main body corresponding to the position of the stationary jaw. The movable jaw and the stationary jaw together form a closed loop. The displacing means is mounted in the main body and comprises a displaceable rod connected to the movable jaw and a gear set for driving the displaceable rod. The knob is connected to the gear set for driving the displaceable rod and the movable jaw for linear displacement. The movable jaw is activated by the displaceable rod to generate a linear displacement, so that the user can operate the clamp meter more easily for measurement.

Abstract: A multi-meter for a test probe includes a main body, two test probes and a clamping means. The test probe includes a test pin, a connecting portion, and a lead electrically connected between the test pin and the connecting portion. The connecting portion is inserted into the main body and electrically thereto. The clamping means comprises a liftable cover and a clamping portion formed on the liftable cover. One end of the liftable cover is pivotally connected to the main body. The clamping portion is configured to clamp the test pin. By this structure, the test pin is clamped by the camping portion to help a user carrying out the measurement.

Abstract: A clamp meter is provided for measuring consumption of current and power of an electrical appliance. The clamp meter includes a power inlet port and a power outlet port that are in controlled connection with each other. A current detection element is arranged between the power inlet port and the power outlet port. When the power inlet port is connected to a power source and the power outlet port is connected to an electrical appliance to be detected, with the electrical appliance turned on, the current detection element detects and converts the current flowing through the power outlet port into a digital signal, which is displayed on a display device mounted on the clamp meter, whereby, through the data and information displayed on the display device, a user may get aware of the power consumption of the electrical appliance and abnormality of power consumption thereof.

Abstract: The clamp meter contains a revolving member configured between the meter's body member and jaw member. The revolving member is composed of a first base and a second base located on the interfacing sides of the body member and the jaw member, respectively. The first base and the second base are revolvably joined together by an axle extended axially from the body member into the jaw member via the first and second bases' aligned axle holes. The first base has at least a roller ball elastically embedded in a concave and exposed towards the second base. The roller ball would roll into one of a number of notches of the second base as the base and jaw members are rotated relative to each other, thereby creating a number of preset configurations of the included angle between the body and jaw members.