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An analytical balance is an instrument used to méasure mass to a very high degree of precision.  The weighing pan(s) of a high accuracy (0.1 mg or better) analytical balance are inside a see-through enclosure with doors so dust does not collect and so any air currents in the room do not affect the delicate balance.  Also, the sample must be at room temperature to prevent natural convection from forming air currents inside the enclosure, affecting the weighing.

Analytical precision is achieved by maintaining a constant load on the balance béam, by subtracting mass on the same side of the béam that the sample is added. The final balance is achieved by using a small spring force rather than subtracting fixed weights.