Fluke 9040 The Fluke phase rotation indicator has a voltage range of 40V to 700V and frequency range of 15Hz to 400Hz. It shows a clear indication of three-phase systems and the phase rotation direction to determine correct connections. This allows rapid determination of phase sequence and frequency range, suitable for commercial and industrial applications. It includes test probes with a variable clamping range for safe contact, also in sockets. Supplied with 3 fused test probes, 1000 V CAT III 3 alligator clips, 1000 V CAT III/600 V CAT IV Users Manual