A must for every pit box! Designed to check the voltage of your packs quickly and easily to see what state of charge they are in. The checker has a DC Voltage range - 2.5v - 30v so good for 1S-4S racing packs and higher. Red digital display, with neat, cool looking black wires to look great on your pit bench. Reverse connection protected, in case of cross connection it wont be damaged. Neatly built with 4/5mm bullet stepped plugs for most common racing battery types.