Feature: 1. Multifunction: Can detect open phase condition and phase sequence through LED indicators and buzzer alert. 2. Frequency Range: 20Hz to 400Hz; equipped with red, green, and yellow LEDs and buzzer indication for clear status feedback, suitable for routine electrical testing tasks. 3. Stable Performance: Provides fast, accurate, and reliable measurements; designed for efficient, safe, and easy operation. 4. Durable Construction: Made from high-quality ABS material; lightweight, wear-resistant, corrosion-resistant, and built for long-term use. 5. User-Friendly Design: Includes dedicated test clips that securely attach to the metal probes of test leads, allowing convenient clamping during measurement. Specification: Item Type: 3 Phase Rotation Tester Material: ABS Model: SM852B Purpose: 3-phase alternating current measurement 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 Clip 1 x Manual 1 x Portable Cloth Bag Note: 1. This is a high-voltage test instrument. Before use, inspect the device for any visible damage. Discontinue use immediately if any of the following conditions are found: A: Visible damage to the housing (such as cracks or broken casing, damaged insulation on test leads) B: The device was subjected to severe impact or compression during transport C: The device has been stored for a long period under improper conditions (e.g., in damp or humid environments) Perform necessary inspection or servicing before further use to prevent electric shock or safety hazards. 2. Never open the device housing during measurement to avoid risk of electric shock. 3. During measurement, high voltage is present on the test leads. Do not touch exposed wires or metal parts of the test leads with bare hands. 4. Even if all phase indicators are off, a voltage circuit may still be present. Exercise caution to prevent electric shock. 5. Do not measure circuits exceeding 600V to ensure safe operation. 6. When measuring at 200V AC, continuous use should not exceed 60 minutes. At 600V AC, continuous use should not exceed 4 minutes. 7. Do not use the device outdoors in rainy conditions or in humid environments to prevent safety hazards. 8. Avoid contact with water or corrosive liquids. Do not store or use the device in direct sunlight, high temperature, or high humidity environments, as this may affect performance. 9. Only qualified personnel should access internal components. Unauthorized disassembly may impair functionality and safety. 10. Operators must be properly trained and familiar with high-voltage measurement procedures. Always follow instructions provided in the manual when performing measurements.