MASTECH MS5900 three-phase motor phase sequence test/rotation direction indicator is a tool specially designed for testing three-phase AC motors. It determines the motor's phase sequence (ABC phase sequence) and direction of rotation without actually touching the motor cable. This testing tool ensures the motor is operating correctly and helps avoid damage or performance issues caused by incorrect connections. MS5900 is a very practical tool, especially suitable for industrial maintenance and installation situations, to help ensure the stable operation of motor systems.