This three-phase rotation tester is designed to check the phase sequence and indicate if the phase is open or not. Features: One unit with two functions: check phase sequence and indicate if the phase is open or not. Safe and reliable: with clips, easily involves the control panel terminals, ensuring reliability and safety. Wide voltage test: it can check 60V to 600V AC three-phase voltage, high performance. Easy to use: with LED light to indicate if the phase is open or not, supports buzzer indication. Portable design: small and light for easy transport. Specifications: Material: Plastic + Metal Working voltage: 60V~600V AC 3-phase Limit Support voltage: 2000V/minute (4000V voltage pulse) Operating frequency range: 20Hz~400Hz Limit time for continuous use: 60 minutes maximum at 60V-AC 4 minutes maximum at 600V-AC Phase sequence indicator light: Green for correct phase sequence, intermittent beep Red for reverse phase sequence, continuous beep Item size: 85 * 64 * 23mm / 3.3 * 2.5 * 0.9in Item weight: 120g / 4.2oz Package size: 120 * 100 * 50mm / 4.7 * 3.9 * 2.0in Package weight: 200g / 7.1oz Packing list: 1 * Phase Indicator