Phase Rotation Indicator for industrial applications. The Fluke 9040 is effective for measuring phase rotation in all areas where three phase supplies are used to feed motors, drives and electrical systems. The included test probes have a variable clamping range for safe contact, also in industrial sockets. Is a portable handheld instrument designed to detect the rotary field of three-phase systems. With three test leads; this rugged tester easily determines a clockwise or counterclockwise direction. Clear LCD display No battery required