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 200V to 480V 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.Specifications:Model:SP8030Operation frequency range:20Hz~400HzLimit time for continuous measurement:60 minutes maximum at 200V AC4 minutes maximum at 480V ACPhase Sequence Indicator LED: Green for correct phase sequence,intermittent beepRed for reverse phase sequence,continuous beepTest pen and cable length:80cm colour: blackMaterial: PlasticPackage Contents:1 x SP8030 Phase Indicator3 x Alligator Clips1 x Carrying BagOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.