Fangrui Product Details Diy Supplies: Electrical Accuracy Class: 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: 136g Colour: Photo Color Material: Plastic Size: 8 X 6 X 2.4cm Package Contents: 1 X 3 Phase Sequence Tester 3 X Alligator Cli