crane scale

A crane scale is a weighing device that uses the relationship between an applied load and the deformation of a spring to measure weight. These devices are commonly used commercially, and when they have high-load capacities, they are often suspended from crane hooks, hence the name "crane scales".1

The principle behind a spring balance, which a crane scale is a type of, is that the springs stretch in proportion to the weight placed upon them. An indicating pointer moves across a graduated dial to show the measurement.1

Cranes themselves are machines designed to lift and move heavy objects horizontally, distinct from devices solely for vertical lifting. Their widespread use began in the 19th century with the advent of steam, internal-combustion, and electric motors.2