Servicing a beautiful vintage voltmeter from 1966

I recently picked up a 1966 Grundig UV4 ("Universalvoltmeter").
In this video I have a first look at it, go over the functionality and do a full service and calibration of the voltmeter.
WARNING: Do not attempt to repair electronic equipment if you don't know what you're doing.
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Music by Karl Casey @ White Bat Audio
Noise video footage by Milan Matos
Electrocution logo by Nesdon Booth, The Noun Project