LED Digital DC Voltage Panel Meter 4.5~30V
Now available from PMD Way are these compact LED digital voltmeters with neat enclosure.
They'll measure beteween 4.5 and 30VDC without any effort at all. You can select from red, green or blue 0.56" LED numerals using the options menu.
The meter is powered from the subject voltage, so you don't need an external power supply. The decimal point automatically changes depending on the voltage, when over 10V DC the display measures down to 0.1V.