Noun
spring balance (plural spring balances)
A device for measuring weight or force by the elasticity of a spiral spring.
Aided by James Swain, the caretaker at his property, the kite line was moored via a spring balance to two sandbags. Source: Internet
Three types of spring balances are called a tape or clock spring balance; channel or block-and-tackle balance; and a spiral or tube balance. Source: Internet