Working current: 20mA
Operating voltage: 4-40 VDC
Measurement rate: 200mS /Times
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LED voltmeters 
Cute little gizmos. More precise than accurate. They have tweaker pots on the back - you may want to tweak them. Mine reported about a volt more than a calibrated meter did until adjusted, and even then wasn't quite right (they don't seem to be entirely linear, either). For rough measurements just fine. Plenty bright display.
Smaller than I expected - should have paid more attention to the sizes noted. The whole thing is invisible under my thumb.
Nice little meter 
Managed to cut a slot into my truck dashboard to fit this. It LOOKS like it was stuck on with tape or glue, beautiful illusion. Direct battery feed, it does not pull enough current to affect the battery for a LONG time. Accurate enough to give me what I need on my battery voltage at any given time. Will purchase again if needed for a new project.
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