A weighing scale (or scale or scale) is a device for measuring weight. The weight calculated by a spring balance or a spring scale is the product of the force on the spring multiplied by the mass of gravity (9.807 M / S2), while the balance or a pair of scales using a balance beam compare the mass by balancing the weight, depending on the weight of one or more known masses that an object bears. Some of them can be calibrated in units of force (weight), such as Newton, rather than mass, such as kilograms. Even if a position with different non-zero gravity field strength is used, the mass can be read correctly by using a balance or a pair of scales with traditional balance weights to compare the mass. Similarly, considering the weight (force) reading, the spring scale can correctly read the weight under different non-zero gravity field strength.

Scales and scales are widely used in business because many products are sold and packaged by quality.