Switch circuit resistance tester

The utility model discloses a switch loop resistance testing clamp, composed of an insulating hand lever, a connecting head which is fixed on the insulating hand lever, a telescopic slide plate which is inserted in the connecting head, a main clamp body fixed on the telescopic slide plate, an auxiliary clamp body which is hinged on the main clamp body, a push-pull rod which is hinged on the connecting head, a compression rod which is in hinged joint with the push-and-pull rod, and a lower clamp body which is hinged on ends of the compression rod; the length of the insulating hand lever is of adjustable. A current terminal and a voltage terminal are arranged on the main clamp body. The lower clamp body is in electrical connection with the voltage terminal and is electrical insulation with the compression rod. The utility model which is used for testing loop resistance of a switch has the advantages of simple and convenient operation, safety, and accurate testing data.