Feature: 12V CAR BATTERY TESTER If the battery needs to be replaced or just needs recharging, BM310 car battery tester tell you the battery health by battery and alternator test. It is for all 12V charging system, including regular flooded, AGM flat plate, AGM spiral and GEL batteries for vehicles, forklifts, hybrid cars, SUVs, Pickups, Boats, Motorcycles, travel Trailers. Alternator check and 6 LED INDICTORS Battery Mate for Car battery health condition checking with 6 LEDs display indicates condition, green means good/full, orange means middle, red means low. simple,Intuitive and clear. Accurate INDICTORS for Early warningPure copper wire and clip make excellent conductivity , high sensitivity(accuracy reaches 0.1V) can accurately read the battery voltage,even if your car has not shown it, it can give you an early warning. Reverse protection functionIt prevents burnout caused by misoperation between the (+)battery post and (-)cable terminal.It helps to extend product life and protect car batteries. Excellent service No-slip design makes you are able to use it flexibly even wearing gloves.Multi-language User Manual: English, German, French ,Spanish, Italianand so on. Specification: - LED quantity: 6 (2 red, 3 green and 1 yellow) - Material of wire: 0.06square millimeter copper - Max. voltage and current: 13.9V 15A - Length of wire: 25cm / 9.84in - Battery tester size: 12.4 x 5 x 1.8 cm / 4.9 x 2 x 0.7 inches (approximate) 6 LED Light Indicator *Check before Charge: Battery is alive, "OK" to be charged. *Alternator check : accelerate your engine to 2000 rpm when the green light is lit ,charging circuit is ok. *Battery check: indicate the percentage charging in the battery. *Cranking check : red light indicates voltage from Alternator over-high. Packing list: 1*12V battery tester WHY CHOOSE BM310 BATTERY TESTER? Reverse connection protection function: uninterrupted operation, full protection of the surge lines, anti-reverse pressure access. View battery test results quickly and accurately - the entire testing process takes just 3 seconds. Pass the low frequency signal test without an external discharge test for large loads. Directly determine whether the vehicle's charging voltage is normal. No leakage, no heat, no sparks, safe operation. Can recognize the overload status of the car battery. Can show the battery condition. BM310 : 12V Car Battery and Alternator Tester for Cars /SUV /Light truck /Motocycle Only compatible with 12V vehicles, such as Cars(Not only the gas cars, but also for Hybrid electric cars), SUVs and motorcycles,light truck. DO NOT support 24V trucks