STETSOM MINI VT Digital Voltmeter. An ultra compact voltmeter for installation anywhere. Accurate voltage follow-up. Perfect for keeping monitoring your reliable sound system with measuring range from 7 to 30Vdc. Features Remote Drive for added security and convenience for your sound system and Blue LEDs. Stetsom Tip: Due to its economical cost, you can utilize a MINI VT STETSOM on each battery of your High Voltage system for your individual monitoring.