Measure Voltage: 5-38V, great mini voltmeter to monitor your vehicle battery status. Universal for: Motorcycle / Boat / ATV / UTV / Camper / Caravans / RV / Caravan etc. It works for 12v-24v, mini size and easy to install, works great for checking voltage, don't recommend using the voltmeter in 24V car like truck / lawn mower. lawn. Mounts in 1-1/8" hole in panels, up to 025" thick, nylon retaining nut holds meter in place. CE certification, made of environmental protection against flame retardant materials, easy to use and install.