uniquegoods Digital Multimeter Voltmeter Socket for Boat Marine Vehicle Motorcycle Truck ATV UTV Car Camper LED Round Panel Green Universal for: Motorbike Car / Boat / ATV / UTV / Camper / Caravans / Travel Trailer etc Fit most of Applications, such as: Marine cockpits, caravan applications, trucks, 4x4s and RV's. It works for DC 6V-30V / 0-10A. Mini size and easy to install, work great for checking voltage. Twist-and-Lock system. Display: 3-bits ,LED digital tube ,lamp display is Green . Mounts in a 1-1/8" hole in panels up, 0.25" thick, The installation hole depth: 1.6" a nylon retaining nut holds the meter in place.