* large lcd display with back light, easy to read under the strong light or the dark environment.
* electronic (not mechanical) rotation test, high reliability.
* 3 phase rotation detector.
* input : 100 - 660 v ac, 45 to 70 hz.
* custom one-chip of microprocessor circuit
* 3 heavy duty alligator clips are included.
* power supply : dc 9v 006p battery.