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Weighing scales (or weigh scales or scales) are devices to measure weight. Spring balances or spring scales calculate weight that is the product of mass into gravity (9.8m/s) on the force on a spring, whereas a balance or pair of scales using a balance beam compares masses by balancing the weight due to the mass of an object against the weight of one or more known masses. Some of them can be calibrated to read in units of force (weight) such as newtons instead of units of mass such as kilograms. The balance or pair of scales using a traditional balance beam to compare masses may read correctly for mass even if moved to a place with a different non-zero gravitational field strength. Also the spring balances that are designed with reading of weight (force) in mind, would read correctly for weight in a different non-zero gravitational field strength.
磅秤和天平在商业中被广泛使用，因为许多产品都是批量销售和包装的。非常精确的天平，称为分析天平，被用于化学等科学领域。
新一代的重量填充机，自动重力称重秤，线性称重机，多头称重机，检重秤，螺旋填充机或测定体积的在食品工业中越来越受欢迎
