YC tuning fork position switch is a new type of position switch. The tuning fork is excited by the crystal to produce vibration. When the tuning fork is immersed in the material level, the vibration frequency changes. The frequency change is detected by the electronic circuit and a switching quantity is output. Tuning fork level switch is also called "electrical float" where the use of float level switch and due to the structure, turbulence, agitation, bubbles, vibration and other reasons can not use the float level switch occasions can be used "electrical float". As the tuning fork level switch has no moving parts, it does not need maintenance and adjustment. It is an upgrade product of the float level switch.