Need a small panel mount voltmeter for a project. That's what it's good for. Snaps securely into the cutout in the project box. Large, easy-to-read display, even outdoors in bright daylight. I removed a star because it reads about 0.2 volts (tested with a calibrated Fluke multimeter). It's close enough for my purposes, but I wish they had an adjustable pot like some of the other options.