External Digital Voltmeter Mod-1

This device is an instrument for measuring and indicating voltage, called a voltmeter, and is not a generating source.
Electric Ink’s external digital voltmeter does not change the current or voltage going to the machine, it just reads and indicates on the display.
Never use it on a power supply with alternating voltage output.
Product developed for direct current (DC).
Electric Ink’s external digital voltmeter was developed to complement DC power supplies that have no output voltage indication.