Editing Weighing scale (section)

====Torsion balance====
[[File:DRX-3.jpg|thumb|Torsion balance scale made by Torbal]]
The torsion balance is one of the most mechanically accurate of analog balances. Pharmacy schools still teach how to use torsion balances in the U.S. It utilizes pans like a traditional balance that lie on top of a mechanical chamber which bases measurements on the amount of twisting of a wire or fiber inside the chamber. The scale must still use a calibration weight to compare against, and can weigh objects greater than 120&nbsp;mg and come within a margin of error +/- 7&nbsp;mg. Many microbalances and ultra-microbalances that weigh fractional gram values are torsion balances. A common fiber type is quartz crystal.<ref>{{cite web |url=https://www.grainger.com/know-how/equipment-information/kh-laboratory-balance-scale-types-care-terms |title = Types of Balances and Scales, Common Terms & Care - Grainger KnowHow}}</ref>