Re: AVO Multimeter survey
There is a steel helmet that sits over the rear of the magnet/movement, which was covered with magnetic 'fur'. As well as giving physical/environmental protection, it appears to be able to grab and retain all magnetic matter that might otherwise jam the moving parts. The downside of this is every time the shunt is tweaked the helmet has to be replaced and screwed down, as calibration depends on it being in place.
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