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Old 12th Jun 2021, 6:35 am   #14
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 18,167
Default Re: Hickok 539b bias gauge

Some meters were made with their mechanical zero adjuster working on the rear spring reference position, having a screwdriver slot at the rear of the case. Have you checked under any label on the rear?

David
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