Feature:Designed to check the phase sequence. With LEDs to show if the phase is open or not, Supports Buzzer indication. Highly reliable, can check a large of 60V to 600V AC three-phase. With Alligator Clips, easily involve the terminals of the control panel, guaranteeing reliability and safety. Small, light and portable, convenient for using. Specification: Operation Voltage: 60V~600V AC, three phase Limit Support Voltage: 2000V/minute (Impulse voltage 4000V) Operation Frequency Range: 20Hz~400Hz Limit Time for Continuous Use:60 minutes maximum at 200V AC4 minutes maximum at 600V AC Phase Sequence Indicator LED: Green for correct phase sequence, Intermittent BeepRed for reverse phase sequence, Continuous Beep Test Leads: Double insulation, Approx. 80cm cable lengthYellow for V(Y) phase (L2. S)Green for W(B) Phase (L3. T)Red for U(R) phase (L1. R) Size: 85 x 64 x 23mmincludes:1 x 3 Phase Sequence Tester3 x Alligator Clips1 x Pouch1 x User Manual