What unit is used to measure the purity of gold?
Grain (unit) carat, or (~ ). The grain was also the name of a traditional French unit equal to . In both British Imperial and U.S. customary units, there are precisely 7,000 grains per avoirdupois pound, and 5,760 grains per troy pound or apothecaries pound. The grain is commonly used to measure the mass of bullets and propellants. The term also refers to a single particle of gunpowder, the size of which varies according to requirements. In archery, the grain is the standard unit used to weigh arrows. In dentistry, gold foil, used as a material to restore teeth, is measured in
Source measure unit Source measure unit The Source measure unit (SMU) is a type of test equipment which, as the name indicates, is capable of both sourcing and measuring at the same time. The source measure unit (SMU), or source-measurement unit as it is sometimes called, is an electronic instrument that is capable of both sourcing and measuring at the same time. It can precisely force voltage or current and simultaneously measure precise voltage and/or current. SMUs are used for test applications requiring high accuracy, high resolution and measurement flexibility. Such applications include I-V characterizing and testing semiconductors and other non-linear devices and