IEC 60051-2:2018 applies to direct acting indicating ammeters and voltmeters having an analogue display.It also applies to:• direct acting indicating ammeters and voltmeters whose scale marks do not correspond directly to their electrical input quantity, provided that the relationship between them is known;• direct acting indicating ammeters and voltmeters and accessories having electronic devices in their measuring and/or auxiliary circuits.This document does not apply to:• special purpose instruments which are covered by their own IEC standards;• special purpose devices which are covered by their own IEC standards when they are used as accessories.IEC 60051-2:2018 cancels and replaces the fourth edition published in 1984. This edition constitutes a technical revision.This edition includes the following significant technical changes with respect to the previous edition:a) updating of content in line with new editions of IEC 60051-1 and IEC 60051-9;b) addition of Annex A to specify the nonconformity classification of test item.This International Standard is to be used in conjunction with IEC60051-1:2016.