Features: 1Small and Convenient: The rotary field tester comes with an instrument storage and transport kit, which is small in size and light in weight, and easy to carry. 2Function: The three phase energy meter rotating magnetic field measuring device can test the frequency range of 20Hz to 400Hz, which is efficient, reliable and simple. 3Easy to use: The phase tester has two function indicators to indicate whether the phase is on or not, and supports buzzer indication. 4Wide Voltage Test: Can detect three phase AC voltage from 60V to 600V, excellent performance. The tester is equipped with 3 clamping cables for convenient installation. 5LED Indicator Design: Green LEDs show the correct phase sequence and beep intermittently. The red LED indicates that the order is reversed and beeps continuously. Package included: 1 x Phase&nbspSequence&nbspMeter 3 x Clip 1 x Bag 1 x Manual