1.One Unit with two functions:Check the phase sequence and indicate the phase is open or not. 2.Safe and reliable:With alligator clips, easily involve the terminals of the control panel, guaranteeing reliability and safety. 3.Wide voltage test:It can check 60V to 600V AC three-phase voltage,high performance. 4.Easy to use:With LED light to show if the phase is open or not,supports buzzer indication. 5.Portable design:Small and light weight,with a carrying bag, convenient to take. This SM852B three-phase rotation tester is designed to check the phase sequence and show if the phase is open or not. Model:SM852B 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 Test pen and cable length:80cm Size:80 x 60 x 24mm Item Weight:135g Package Information: Package Size:17 x 11 x 4.6cm / 6.7 x 4.3 x 1.8in Package Weight:239g / 8.4oz Package List: 1 x SM852B Phase Indicator 3 x Alligator clips 1 x Carrying Bag 1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.