The button has body (1) separated into two parts (2, 3) and having a front side (4) which is pressed by a user for activating a measurement instrument, and a rear side (5). The part (2) is made of a conducting material and the part (3) is made of an insulating material. The part (3) supported on the rear side of the body has a conducting pad (6) at its free end (31). An independent claim is also included for an electrical measurement instrument for measuring defective voltage.
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