Features 1、Multifunction: It can detect the state of the open phase and the sequence of the phases through LED and buzzer 2、Frequency Range: 20Hz to 400Hz, equipped with red, green, yellow LED indicates the buzzer, which can meet the needs of daily work 3、Stable Performance: Fast and accurate measurement, efficient, effective, reliable, easy and safe to use 4、Good Material: Made of high quality ABS material, lightweight, wear resistant and corrosion resistant, and have a long service life 5、Convenient to Use: Equipped with a special test clip, insert the test clip on the metal probe of the test lead and tighten it, then it can be conveniently clamped anywhere for measurement Specification Item Type: 3 Phase Rotation Tester Material: ABS Maodel: SM852B Purpose: 3 phase alternating current measurement Measurable Frequency Range: 20Hz~400Hz Continuous Use Time: no more than 60 minutes at 200V ACV, no more than 4 minutes at 600V ACV Package List 1 x 3 Phase Rotation Tester 3 x Clip 1 x Manual 1 x Portable Cloth Bag