UT261 series is used for determining the 3-phase power phase sequence, missing phase indication, and motor phase rotation (UT261B). UT261A and UT261B can measure AC voltage of 40~700V and 90~600V respectively.  These devices can operate in the frequency range of 15~400Hz. UT261 are durable devices that can withstand impact from 2 meters height. Test leads with protective tubing are included in optional accessories. Features: Built-in LCD No battery required Phase sequence indication Missing phase indication Specifications Model: UT261A Function: Phase sequence & motor rotation indicator Frequency range: 15–400Hz Application: Three-phase systems Portable handheld design Uses Checks phase sequence in power systems Verifies motor rotation direction Used during motor installation Suitable for maintenance work Ideal for industrial and commercial use Package Includes: 1 x UNI-T UT-261A Phase Sequence