q.g._de_bakker Posted March 21, 2022 Share Posted March 21, 2022 There's always a range outside of which any meter does not work (properly). Relying on what is, now was, readily available is not bad design. Old meters, those with CdS cells using mercury batteries, were (and are) as accurate as any 'modern' meter. Link to comment Share on other sites More sharing options...
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