Features: Fast and accurate measurement results. Open phase indication and phase rotation indication 2 functions. Checks open phases and identifies 3 phase sequence condition. With simultaneous indications via LEDs and audible buzzer sound. Indicates direction of the rotation. Ensures the object being tested is not damaged from incorrect wiring. Portable, compact design and meet the IEC?348 electrical safety standards. Specifications: Working Voltage: 60V~600V (AC, three phase) Continuous Use Time: 60 minutes at 60V AC; 4 minutes at 600V AC Working Frequency Range: 20Hz?400Hz Maximum Withstand Voltage: 2000V/min (impulse voltage 4000V) Test Leads: Double insulation Test Lead Length: Approx. 1meter/3.3ft Protection Level: 2000V Operating Temperature: ?10~60 Size(L x W x D): Approx. 8.3 x 6.5 x 2cm/3.27 x2.56 x 0.79in Weight: 253g(approx.) Package Includes: 1 x Tester 3 x Test Leads with Clips 1 x Bag