Feature: 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 Tester3 x Clip1 x Manual1 x Portable Cloth Bag Note: 1. It is high voltage test equipment. Before use, observe whether the meter is in good condition. If the following conditions occur, stop using it, and perform corresponding inspections and repairs to avoid electric shock and unsafe accidents. A: The appearance is obviously damaged (such as cracks or damage in the shell, broken skin on the test lead) B: It was severely squeezed during transportation C: It has been idle for a long time under improper conditions (such as in the bathroom or a relatively humid place).2. Never open the case during the measurement process to avoid electric shock and unsafe accidents.3. During the measurement, there is a large voltage input from the test lead. Do not touch the bare wire or the metal part of the test lead directly with hands to avoid electric shock.4. Although sometimes all the phase indicators are not lit, but there is still a voltage loop, pay attention to prevent electric shock.5. The circuit voltage should not be higher than 600V during measurement to avoid unsafe accidents.6. When measuring 200V ACV, the continuous use time should be no more than 60 minutes when measuring 600V ACV, the continuous use time should be no more than 4 minutes.7. It is not allowed to use for measurement in rainy outdoor and humid environment, so as to avoid unsafe accidents.8. Do not let the meter contact with water or other corrosive liquids, and do not place it in an environment with direct sunlight or high temperature and relatively humid temperature, so as not to affect its test performance.9. Non professionals are forbidden to open the casing of the meter, so as not to affect its test performance.10. The operator who uses the meter should have received special training, understand the related knowledge of high voltage operation and measurement, and carry out the measurement operation in strict accordance with this manual