A check scale is a scale generally associated with filling containers with product. Bag fillers, such as potatoes, or other produce are one application. Drum, box, and bale fillers are others. When contained in a conveyor belt

Conveyor belt

A conveyor belt consists of two or more pulleys, with a continuous loop of material - the conveyor belt - that rotates about them. One or both of the pulleys are powered, moving the belt and the material on the belt forward. The powered pulley is called the drive pulley while the unpowered pulley...

line, the scale may also be called a checkweigher. The checkweigher's controller uses algorithms designed to monitor the weight of the container being filled, and reduces the flow as the target weight is approaching. When the target weight is reached, the filler is told by the checkweigher to shut off the flow.