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 Fluke 9040 is a rotary field indicator and can provide clear indication of the 3 phase via an LCD display and the phase rotation direction to determine correct connections. It allows rapid determination of phase sequence and has a voltage (up to 700 V) and frequency range suitable for commercial and industrial applications. The included test probes have a variable clamping range for safe contact, also in industrial sockets. 3 phase indication. Indication of phase rotation. Clear LCD display. No battery required. 40 to 700V voltage range. 15 to 400 Hz frequency range. Continuous operating timer. 0 to 40 degree C operating temperature. IP 40 Dust/water resistance. Measures 61mm width by 124mm height by 27mm depth. 2 years warranty.