Weighing sensor is a kind of to gravity into electrical signals and electrical switching device, the force is a key component of the electronic weighing apparatus.

Force can be implemented to electricity conversion there are many types of sensors, common resistance strain type, the electromagnetic type and condenser, etc. The electromagnetic type is mainly used for electronic balance, capacitor used in some electronic crane scale, and most of the instruments or resistance strain type weighing sensor is used for the product. Resistance strain type weighing sensor structure is simple, high accuracy, widely applicable, and can be used in a relatively poor environment. So the resistance strain type weighing sensor has been widely used in instruments.