浴室秤Tanita - NSL - HA-650

体重秤（要么称重秤orscales）是测量的设备重量。春季余额or春天scales计算重量这是重力的质量的产物（9.807米/秒²）在弹簧上的力上，而使用平衡梁的平衡或一对秤通过平衡由于对象的质量抵抗一个或多个已知质量的重量而通过平衡重量来比较质量。其中一些可以校准以以力（重量）为单位读取（重量）纽特instead of units of mass such as千克。使用历史或天平的平衡l 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.

一种春天scale通过报告a的距离来测量质量春天deflects under a load. This contrasts to a平衡那which compares the扭矩由于样品重量，在臂上扭矩on the arm due to a standard reference mass using a horizontallever。弹簧鳞片测量力量， 哪一个是紧张力量of constraint acting on an object, opposing the local力量of gravity.^[6]They are usually校准so that measured force translates to mass at earth’s gravity. The object to be weighed can be simply hung from the spring or set on a pivot and bearing platform.

In a spring scale, the spring either stretches (as in a hanging scale in the produce department of a杂货店）或压缩（如简单的浴室刻度）。经过胡克定律，每个春天都有一个比例常数，与它延伸有多远的速度有关。称重秤使用a春天具有已知的弹簧常数（见胡克定律）通过任何各种机制测量弹簧的位移以产生估计引力力量applied by the object.^[7]齿条和小齿轮机构通常用于将线性弹簧运动转换为拨号读数。