A mechanical balance is a device used to measure the mass of an object. It operates on the principle of equilibrium, where the weight of the object being measured is balanced against known weights. This type of balance typically consists of a beam that pivots on a fulcrum, with scales on either side to indicate the mass. Mechanical balances are commonly used in laboratories, schools, and various industries. They are valued for their simplicity and reliability, as they do not require electricity to function. Examples of mechanical balances include beam balances and spring scales, which are both effective for precise measurements.