Why a spring balance does not give correct measurements when it has been used for a long time?

Assertion : Spring balances show correct readings even after they had been used for a long time interval. Reason : On using for long time, spring balances losses its elastic strength.

Assertion : Spring balances show correct readings even after they had been used for a long time interval. Reason : On using for long time, spring balances losses its elastic strength.

Why do spring balances show wrong readings of weight after they have been used for a long time?

Why do spring balances show wrong readings after they have been used for a long time?

(A): Spring balances show wrong readings after they has been used for a long time (R): On using for a long time, spring balances loose its elastic strength