The Amprobe BT-250 Circuit Breaker Tester works on powered systems from 90 to 280V AC and is designed for use in residential and light commercial environments. Comes complete as a Circuit Breaker Tester kit with transmitter, receiver, socket/test lead cable set with insulated alligator clips and a light fixture adapter. All housed in a professional hard carrying case. The BT-250 Circuit Breaker Tester is a preferred solution for the latest in code requirements. Identify circuit breakers fast and efficiently.