MICTUNING MIC-VM DC 12V LED Display Voltmeter Waterproof for Boat Marine Vehicle Motorcycle Truck ATV UTV Car Camper Caravan Blue Digital Round Panel It works for 12v-24v, mini size and easy to install, work great for checking voltage, not recommend to use the voltmeter in a 24V car like truck/ lawnmower Twist-and-lock system Display: 3-bits, LED digital tube, Lamp display is Blue Universal for: motorbike car/ boat/ ATV/ UTV/ camper/ caravans/ travel trailer etc. Mounts in a 1-1/8" hole in panels up, 025" thick, a nylon retaining nut holds the meter in place Fit most of applications, such as: marine cockpits, Caravan applications, trucks, 4x4S and RV's MICTUNING voltmeter is high quality with completive price, it's the best choice for your battery