A checkweigher is a machine used to check the weight of packaged commodities to ensure that they are within specified limits. Operation can be manual or automatic and the machine will reject any products that are out of specification (either too heavy or too light).
Checkweighers come in many different sizes, configurations and capabilities and can process products weighing a fraction of a gram through to items weighing hundreds of kilograms. These machines can operate continuously at extremely high speeds in all types of environments. In addition to being able to separate and classify products in terms of weight, they can be engineered to include a variety of additional features including metal detection (for contaminants), barcode scanning, temperature sensors and holographic scanners.