INSTANT STATE OF CHARGE READING - Push the button to see whether your 12 volt battery is weak or fully charged, giving you a fast diagnostic check before heading out on the road, water, or trail.
TOOL-FREE CHARGER CONNECTION - Attach a Battery Doctor charger directly to the tester for a simple, tool-free recharge when the battery reads low, so you do not need to disconnect terminals to top off the charge.
DIRECT BATTERY INSTALLATION - Ring terminals attach directly onto the battery posts, and the 24 inch lead wire provides slack to position the tester where the indicator is easy to see during a check.
REVERSE POLARITY PROTECTED - Built-in reverse polarity protection guards the tester against incorrect hook-up, and an inline 3 Amp fuse is included to help protect the circuit during use.
PAIRS WITH BATTERY DOCTOR CHARGERS - Designed to work with the Battery Doctor charger line so you can test and recharge using one connected setup, supporting trucks, cars, boats, RVs, ATVs, motorcycles, and more.