Usage Tips: This three-phase rotation tester is designed to check the phase sequence and show if the phase is open or not. Features: One Unit with two functions: check the phase sequence and indicate the phase is open or not. Safe and reliable: with clips, easily involve the terminals of the control panel, guaranteeing 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 show if the phase is open or not,supports buzzer indication. Portable design: small and light weight for easy carrying. Specifications: Material: plastics+metal Operation voltage: 60V600V AC three phase Limit support voltage: 2000V/minute (impulse voltage 4000V) Operation frequency range: 20Hz400Hz Limit time for continuous use: 60 minutes maximum at 60V-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 Item size: 85 * 64 * 23mm / 3.3 * 2.5 * 0.9in Item weight: 120g / 4.2ounce Package size: 120 * 100 * 50mm / 4.7 * 3.9 * 2.0in Package weight: 200g / 7.1ounce Packing List: 1 * Phase Indicator