Phase Sequence Detector Non Contact Tester 3PH AC Meter Monitor with Magnetic Base Dia 10‑40mm Item Type: VC850D AC Phase Sequence Meter Model: 850D Clamp Wire Diameter: Approx. 10 ~ 40mm / 0.39 ~ 1.57in Function: Phase Sequence Check(positive, reverse, missing phase), live wire check, simple electricity check, breakpoint location, line maintenance Power Supply: DC3V, 2 x AA batteries(not included), continuous use about 70 hours Live Voltage Range: AC 60-1000V, 45-65Hz (continuous input of sinusoidal wave) LED Display: Positive Sequence Check: 4 indicator lights illuminate in CW direction Reverse Phase Check: 4 indicator lights illuminate in CCW direction Live Electric Check: Light on for L1, L2, L3 Missing Phase Check: No lights on for L1, L2, or L3 Breakpoint Check: No lights on for L1, L2, or L3 Audible Alert: Positive Phase: Intermittent short beep, Reverse Phase: Continuous long beep Battery Indicator: Power LED light up after startup; Low battery indicator light up for low power Mounting: Equipped with four magnets on the back, latch onto the distribution box, can support up to 800g weight Auto Power Off: Automatically shut down after 5 minutes of inactivity Operating Temperature And Humidity: -10℃-55℃, below 80% RH Storage Temperature And Humidity: -20℃-60℃, below 90% RH Insulation Strength Test: >500MΩ between the clamp and the casing Compliance: Suitable For safety standards EN61010-1: 2001; EN61010-031: 2002; Pollution degree 2, CAT III 1000V, transient overvoltage 6000V Battery: 2 x AA alkaline batteries(LR6)(not included)