|Hewlett-Packard 410B Vacuum Tube Voltmeter [Detail]|
|Written by Accutron on 2008-01-30|
HP 410B vacuum tube voltmeter, serial number 024-45323. The blue case and bright blue non-riveted nameplate date the meter as an early 1960s unit.
410B, left side internals.
410B, right side internals.
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