Small and convenient: rotary field tester with instrument storage and transport kit, small size, light weight, easy to carry. Function: The testable frequency range of the rotary field measuring device, three-phase electricity meter, is from 20 Hz to 400 Hz, efficient, effective, reliable and simple. Easy to use: This SP8030 phase tester has two function indicators to check the phase sequence and indicate whether the phase is open. Wide Voltage Test: This gauge can detect 3-phase AC voltage from 60V to 600V with excellent performance. LED light can indicate whether the phase is on and support buzzer indication. Design: Green LED shows correct phase sequence and beeps intermittently. The red LED shows the sequence reversed and beeps continuously. The tester is equipped with 3 clamp cables for your convenience. Continuous use: no more than 60 minutes at 200 V ACV, no more than 4 minutes at 600 V ACV. Specification: Model: SM852B Operating voltage: 60V ~ 600V three-phase AC voltage Maximum dielectric strength: 2000V/min (voltage pulse current 4000 V) Measurable frequency range: 20 Hz ~ 400 Hz Meter size: 85 X 64 X 23 mm (without test lead) Weight: about 200 g Condition: 100% Item Type: Hearing Aid Battery Tester Colour: as shown Material: Plastic Package Contents: 1 x solenoid tester kit