• KEW8031F is designed to check phase sequence. Lamps provided on the unit will also tell you if a phase is open. • Can check a wide range of 3-phase power source from 110V to 600V. Sealed against dust, the unit ensures trouble-free performance. • Small, Lightweight and portable. Designed for maximum ease of operation and ruggedness. • No exposed metal parts, Safety features are incorporated including the instant push button switch operation.