A load cell (or loadcell) is a transducer which converts force into a measurable electrical output. Although there are many varieties of force sensors, strain gauge load cells are the most commonly used type. https://youtu.be/SrXoIpBAYrQ Features: Multi-Functional Control Purpose Indicator Limit/Packer/Checker/Testing Application 3pcs Control Relay built-in - 2 Set Point Specifications: 1/8 DIN Size: 48(W) X 48(H)mm Power : DC 24V without polarity(Consumption about 500mA per 1 Load Cell) Option : RS422/485, 0-10V/4-20mA Package Include: 1 X Toyo Sokki DLS-5028 Digital Load Cell Reader