DIY Supplies: Electrical Accuracy Cla: 0.1 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. 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: Photo Color 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 User Manual Notes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please allow slight dimension difference due to different manual measurement. 2. Manual measurement, please allow 1~2mm error, thank 3.Don't open the dispute ,pls ,any questions ,feel free to contact with our customer service ,we can slove your problems .