The voltmeters I ordered from China have just arrived and they are lovely little toys. Very small, not much bigger than the display alone, and only two wire connection. They operate on any voltage from 2.5V to 30V and just work. They cost me 99 pence each and are brilliant. I intend to couple them with one of my homebrew mains power supplies and a DC-DC converter to make up some very useful variable power boxes for my various projects.
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