Source:http://linkedlifedata.com/resource/umls/id/C0179199
UMD: Measuring instruments designed to determine the mass of a body, using the force of gravity on the body (weight) as a basis for comparison. The result read from the balance is generally taken as a measure of the quantity weighed; corrective calculations are done only in exceptional cases. In practice, most balances measure in grams, although other units such as ounces and grains are also used. Balances are mostly used for clinical laboratory measurements; they are usually placed on a vibration-free workbench.