DIN EN 60051-6:2017-02

This part also applies to some non-interchangeable accessories of ohmmeters (impedance Meters) and conductance meters. Direct acting indicating electrical measuring instruments whose scale marks do not correspond directly to its electrical input quantity, provided that the relationship between them is known. This part also applies to electronic devices of ohmmeters (impedance meters) and conductance meters in their measuring and/or auxiliary circuits. This part does not apply to insulation ohmmeters, grounding ohmmeters and external commercial power ohmmeters (impedance meters) and conductance meters.