sm852b 3 phase rotation tester digital phase indicator led buzzer fasevolgorde meter voltage tester 60v ~600v ac

characteristics: 1. a unit with two functions: check the phase range and indicate the phase is open or not. 2. safe and reliable: with alligator clips, easily connect the terminals of the control panel, guarantee reliability and safety. three. wide voltage test: it can control 60v to 600v ac three-phase voltage, high performance. four. easy to use: with led light to support buzzer indication when the phase is open or not. 5. portable design: small and light weight, with a carrying bag, conv