Vintage Hand held Dual Scale Pocket Watch Voltmeter & Ammeter

This 1920/30s Vintage Hand held Dual Scale Pocket Watch Voltmeter & Ammeter is a wonderful design.
In fairly good condition, there is some discolouration, loss of chrome, and surface scuffing commensurate with age and use. It has not been tested and I don't know whether or not it is working.

The green Ampere scale measures 0-15 amps, and the red Voltmeter scale measures 0-6 volts. The scales are handwritten on a card background, and the lead ends are colour coordinated.

Approximate Size: 4.7 cm in diameter & 2 cm in depth.

It resembles the generic radio voltmeters made in France/Switzerland during the same time period. It seems likely that the same factory made ammeters/voltmeters for different companies and badged them under several names.

This piece of vintage technology would have been carried around in a pocket as a handy tool for the engineer to make a quick (but not necessarily accurate) measurement. It now makes an interesting display item for a vintage engineering tool collector, or a tactile desk ornament. 

NB: The images have been taken with and without flash hence the differences in colour.

Please click on the following link for more vintage test meters.
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