This standard specifies the terminology and performance characteristics of seven types of products used in instruments and meters, including mechanical components, elastic components, sensitive components, electromechanical components, instrument motors, instrument light sources and display devices. This standard applies to instrument components. Note: The words or words in square brackets () in this standard can be omitted or used as the previous replacement words if there is no confusion; the words or words in parentheses () are the former except for explanation. synonyms.