Load cells are sensors that detect force (mass, torque, etc.). When force is applied to a load cell, it converts the force into an electrical signal. Load cells are also known as "load transducers," because they convert a load (force) into electrical signals.
The separator that shows the presence of any substance in the tested environment is called an indicator. Loadcells perceive the weight on the platform as mV and send it to the indicator. The weighing indicator interprets the mV it receives as kg.
A checkweigher is an automatic or manual machine for checking the weight of packaged commodities. It is normally found at the offgoing end of a production process and is used to ensure that the weight of a pack of the commodity is within specified limits.