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smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> Here's How << 
That thing on the right is an old fashioned dial car phone.
Whatreya, new?
Not only does one not need a voltmeter that measures to +40 volts, I would really worry if it read -40 volts!Just looks like a volt meter for measuring battery voltage. Not necessary to have such a scale, but maybe that;s just what the person had available and should work.
Which is why it's a voltmeter overlay face on an amp meter.Not only does one not need a voltmeter that measures to +40 volts, I would really worry if it read -40 volts!