Test weights are divided into different accuracy classes. From E0 (most accurate) via E1, E2, F1, F2, M1, M1-2, M2, M2-3 to M3 (most inaccurate). It can be said that the further ahead the letter is in the alphabet and the smaller the following number is, the more accurate the respective weight is. These weights, which are classified according to error margins (OIML), are used for various purposes, depending on production accuracy or permissible variations in mass.
The classes E0, E1 and E2 are called normal weights. They are used for traceability to national standards (E0) and are used for the calibration of high-precision scales (E1) or precision scales of class I (E2)
In the weighing industry, we define precision balances as “a balance used to weigh quantities to a very precise number, usually up to one milligram”. They’re sometimes referred to as “top loading balances”. Also, precision balances have a higher capacity than analytical balances, but a lower readability.
A flat plate with a scale and pointer for showing measurements of weight, volume, or pressure