Fluke 9040 phase rotation indicator fluke fluke 9040 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 this rotary field indicator 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 700v and a frequency range suitable for commercial and indust