Feature: 1. Multifunction: It can detect the open phase status and phase sequence through LED indicators and buzzer alerts. 2. Frequency Range: 20Hz to 400Hz, equipped with red, green, and yellow LED indicators and buzzer for clear signal feedback, suitable for routine testing tasks. 3. Stable Performance: Provides fast, accurate, and reliable measurements; designed for efficient, safe, and easy operation. 4. High-Quality Material: Constructed from durable ABS material; lightweight, wear-resistant, corrosion-resistant, and built for long-term use. 5. User-Friendly Design: Includes a dedicated test clip that securely attaches to the metal probe of the test lead, allowing convenient clamping at various measurement points. Specification: Item Type: 3 Phase Rotation Tester Material: ABS Model: SM852B Purpose: 3-phase alternating current phase rotation detection Measurable Frequency Range: 20Hz ~ 400Hz Continuous Use Time: Up to 60 minutes at 200V AC, up to 4 minutes at 600V AC Package List: 1 x 3 Phase Rotation Tester 3 x Test Clip 1 x User Manual 1 x Portable Cloth Bag Note: 1. This is high-voltage test equipment. Before use, inspect the device for damage. Discontinue use if any of the following occur: visible damage (e.g., cracks or broken housing), damaged test leads, physical impact during transit, or prolonged storage in unsuitable conditions (e.g., humid environments). Perform inspection and repair before further use to prevent electric shock or accidents. 2. Never open the device casing during measurement to avoid risk of electric shock. 3. During measurement, high voltage is present on test leads. Do not touch exposed wires or metal parts directly to prevent electric shock. 4. Even if all phase indicators are off, voltage may still be present. Exercise caution to avoid electric shock. 5. Do not exceed 600V circuit voltage during measurement to prevent safety hazards. 6. Maximum continuous use: 60 minutes at 200V AC, 4 minutes at 600V AC. 7. Do not use outdoors in rainy conditions or in damp environments to avoid electrical hazards. 8. Avoid contact with water or corrosive liquids. Do not store in direct sunlight, high temperature, or high humidity environments to maintain performance. 9. Unauthorized personnel must not open or disassemble the device, as this may impair functionality and safety. 10. Only trained personnel familiar with high-voltage operations and measurement procedures should use this device. Follow all instructions in the manual carefully.