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That instrument was built by Jetronic Industries of Philadelphia. The blue precision resistors are a giveaway.
Jet also built the later versions of the WV98 and WV77 VTVMs as well. All had soldered-in batteries, primarily for cost. The low contact resistance was a byproduct.
The WV87 is a decent instrument for the time period and cost. All three use the same basic circuit. Component quality and features improve with price. The WV87 measures current.
Jetronics took over the RCA test equipment line, renaming it VIZ.
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