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Weighing scale
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====Strain gauge scale==== In electronic versions of spring scales, the deflection of a beam supporting the unknown mass is measured using a [[strain gauge]], which is a length-sensitive [[electrical resistance]]. The capacity of such devices is only limited by the resistance of the beam to deflection. The results from several supporting locations may be added electronically, so this technique is suitable for determining the mass of very heavy objects, such as trucks and rail cars, and is used in a modern [[weighbridge]].
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