Check-weighing scales enable the speedy filling of containers or bags with a specific identical weight of contents, referred to as the 'target' weight. This can be set to any weight value and give an indication when this weight is reached. The 'tolerance' value (the amount above or below the target that is acceptable) can also be set as wide or narrow as required. The indication is typically a green light for OK, yellow for underweight and red for overweight. An audible sounder indication is also available on many models of counting scale.