A balance scale is used for weighing substances in a chemistry laboratory. One example of a balance scale, the analytical balance scale, can measure substances with a precision of one-tenth of a milligram or one-ten-thousandth of a gram. Analytical balances can detect the weight of a single grain.
Analytical balances should be tared before use. This process is also known as recalibration, and it should be done to 0.0000 of a gram. The container used to hold the substance to be weighed should be tared as well. Containers must be dry and at room temperature before being placed on the scale, since an elevated or reduced temperature can cause apparent changes in the container's mass.