Interesting pocket voltmeter

Hi All!

I couldn't find anything about this interesting pocket voltmeter with a revolver switch on the internet. Unfortunately, I couldn't find anything about the Neo brand either.
Does anyone have any information?

radiomuseum.org/r/unknown_eu_neo_pocket_voltmeter_with_revolve_switch_dc_0.html

BR,

 

STS

Attachments:

• Neo1 (216 KB)

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