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. DIY Supplies:Electrical Accuracy Class:0.1 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 AC 4 minutes maximum at 600V AC Phase Sequence Indicator LED: Green for correct phase sequence, Intermittent Beep Red for reverse phase sequence, Continuous Beep Test Leads: Double insulation, Approx. 80cm cable length Yellow for U phase (L1.R) Green for V Phase (L2.S) Red for W phase (L3.T) Net Weight:189g Colour:As Shown Material:Plastic Size:8 x 6 x 2.4cm Package Contents: 1 x 3 Phase Sequence Tester 3 x Alligator Clips 1 x Pouch 1 x English User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.