52 mm ROUND STATE OF CHARGE METER. 48v Meter Made in the U.S.A. These meters work on lead-acid batteries only. THIS METER COMES WITH MOUNTING HARDWARE TO MOUNT IN 2" HOLE. (U bracket, Nuts & washers) THIS BATTERY METER ALLOWS YOU TO SEE HOW MUCH CHARGE IS IN YOUR BATTERIES AND WHEN THEY NEED CHARGING. DON'T GET STUCK RUNNING OUT OF POWER, INSTALL A BATTERY GAUGE TODAY. INSTALLATION IS VERY EASY, ONE POWER AND ONE GROUND WIRE TO HOOK UP TO THE STANDARD 1/4" SLIP-ON ON TERMINALS. METER MOUNTS ANYWHERE, MEASURES 2-3/16''O.D. x 1-3/4 DEEP. FITS ALL CARTS WITH 48 VOLT SYSTEMS