This paper draws attention to the more important specifications of the British Standards Institution, dealing with industrial electrical measuring instruments (other than electricity meters), and compares their provisions with those of corresponding specifications issued in other countries. Suggestions are also made for their extension or amendment.For this purpose, standardization is classified in three groups, as follows:(1) Dealing with limits of performance.(2) Dealing with limits of dimensions or other attributes, intended:(2.1) to secure interchangeability, or(2.2) to cheapen manufacture by concentration upon a small variety of products.(3) Dealing with such matters as preferred terms, definitions, symbols, etc.The majority of B.S. Specifications so far issued fall into Group (1), but it is suggested that there is room for an extension of Group (2) and more particularly of (2.2), sometimes known as “simplification,” but for which the term “concentration” is proposed as being less liable to misunderstanding.