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Old 4th Jun 2021, 8:03 am   #1
resurgance's Avatar
Join Date: Apr 2021
Location: Nelson, New Zealand
Posts: 15
Default Hickok 539b bias gauge

Hi there,
I understand that Hickok is mainly US and AVO is more UK, so apologies if this is not quite the place for thjs question?
I have a 539b with a bias gauge sans adjuster but reading above zero.
Any ideas please on how to return this to zero?
It reads this way unpowered as well as powered.

Stew Thorp
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