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  1. SCHUE

    Rule of Thumb

    Many thanks for your reply, the mic's I have belong to my Father and I believe now from what you say it was a crude way of checking the calibration your self and then zeroing, before QA QC got so hot,all his mic cases contain an old penny and I was just trying to remember the procedure Cheers...
  2. SCHUE

    Rule of Thumb

    Back in the day I know there is a rule of thumb for setting a micrometer with an old copper Penney does anyone know the reasoning and procedure please

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