ST-850/855 PR - Phase Sequence Indicators

Two functions in one unit. It is designed to check phase sequence. Lamps provide on the unit will tell you whether phase is open or which phase is open at a glance. Large size alligator clips. Highly reliable. Allow you to check a wide range of 3-phase power source from 90V to 600V. Sealed against dust, the unit ensures highly dependable and trouble free performance.