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LED for open phase check LED: Three orange LEDs indicate U phase, V phase and W phase. LEDs for phase sequence check: one red LED and one green LED The strap: set on the wrist to avoid the instrument slipping from the hand. Specifications: Working Voltage: 60V~600V (AC, three phase) Continuous Use Time: ≤60 minutes at 200V 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*W*D): 150*50*20mm/5.9*2*0.8in Weight: 253g(approx.) Package Includes: 1 x Tester 3 x Test Leads with Clips