This antique electromechanical voltmeter has 2 scales that represent two analogue measuring ranges from 0 to 6 and from 0 to 120 V.
The front panel of the voltmeter has an arrow indicating the scale of the measurements 6 V or 120 V. The voltmeter has two probes, labeled black and white, and a cord that goes from the top of the instrument. The instrument is in the form of bulb, this design was very common at the beginning of the last century. On top of the instrument has a special ring - the holder. The unit can be hung on a chain, like a pocket watch.
Made in Germany. Approximate year 1910-1914.