Vibrating Weight Sensor: After there is a force on the elastic element, its natural vibration frequency is proportional to the square root of the applied force. By measuring the change in natural frequency, we can obtain the force of the measured object acting on the elastic element and then its mass can be obtained. There are two types of vibrating sensors: vibrating wire and tuning fork type. Electromagnetic Coll Sensor Cable Input Pulse Train Tensioned Wire Output Signal The elastic element of a vibrating wire sensor is a string wire. When the object is on the load-bearing platform, the intersection point of the V-shaped string is pulled down and the pulling force of the left string increases and the pulling force of the right string decreases. The inherent frequencies of the two strings change differently. If we calculate difference between the the two frequencies, We can obtain the mass of the object. The accuracy of the vibrating wire sensor is high, up to 1/1000- 1/10000, and the weighing range is 100 grams to several hundred kilograms, but this sensor has a complex structure, the processing is difficult and the cost is high.