3-phase rotation tester SM852B is designed to detect the state of open phases and the phase sequence. It provides LED and buzzer indicators for easy identification. Frequency range 20 Hz to 400 Hz supports a variety of current testing needs. It uses red, green and yellow LEDs plus a buzzer to give clear signaling. Stable performance with fast and accurate measurements delivers efficient and reliable results. The unit is user-friendly, promoting safe and easy operation. Made of durable ABS material, the tester is lightweight and wear-resistant, ensuring a long service life and reliability for professionals. Applications: - Verifying correct phase sequence and identifying open phases during panel wiring and motor commissioning. - On-site testing of three-phase circuits in industrial equipment, such as motors, drives, transformers, and feeders. - Routine maintenance checks in manufacturing facilities, HVAC systems, and electrical installations to confirm phase integrity.