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spring balance(esp US), spring scale
a device in which an object to be weighed is attached to the end of a helical spring, the extension of which indicates the weight of the object on a calibrated scale
spring balance[′spriŋ ¦bal·əns]
An instrument which measures force by determining the extension of a helical spring.
A sash balance in which the weight of the sash is counterbalanced by the force supplied by a spring.