At present, potentiometers employed for scooter speed regulation are high-quality contact-type variable resistors. They are expensive because of the requirements on reliability and durability and will inevitably incur problems of wearing after a long time in use. To obviate the above mentioned drawbacks, a non-contact potentiometer based on a well-established magnetism detector is developed in this paper. Since there is no contact, nor moving parts in the device, the problem of wearing is solved. Also, the potentiometer is designed to be completely compatible with existing con- tact potentiometers in terms of electrical and mechanical specifications. Hence, the cost for the device is cut down. Moreover, A broken spring that normally causes a hazard is isolated by the processing circuit by stopping the scooter. A prototype of the device has been built and tested. Results show that the device can be used as a replacement for traditional contact potentiometers.