A voltmeter is high impedance so very low current draw, so when you go to measure voltage it won't load the circuit and give you an incorrect reading. A battery operated voltmeter will draw something from the circuit measured, but nothing of concern. A voltmeter that gets its power from the circuit, like the 12v outlet meter shown above will draw more. I would pull that type of meter when not needed.
You can get banana plugs from Radio Shack and attach them to the pigtail. Then you don't need the probes.
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Zdomain, Minnesota
2014 Thor Four Winds 28z
DW, 2 boys, 1 knuckleheaded yellow lab
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