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Yes that's what it is. The frequency range is unknown but those seldom went above audio. Some exceptions - there were some rf ones but they weren't digital.
Very expensive when new. Not terribly useful.
I have an antique digital voltmeter (1965?), five digits, AC and DC, covers the audio range, and the specs say it's 0.01% on DC. It hasn't been calibrated in years but it too uses Nixie tubes for a readout. It is in three units, the readout, the power supply, and the AC converter. It works fine but I'd really like it to find another home.
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