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MSP678 generator speed probe is a magnetoelectric speed sensor which uses electromagnetic induction principle to measure speed. There is a coil around the front end of the sensor. When the gear rotates, the magnetic force line through the sensor coil changes, and a periodic voltage is generated in the sensor coil. By processing and counting the voltage, the speed of the gear can be measured. The sensor shell is made of stainless steel, with strong output signal, good anti-interference performance, easy to install and use, and can be used in smoke, oil gas, water gas and other harsh environments.