[ACCURATE CAR BATTERY TESTER] BM310 battery tester offers you an easy way to analyze the battery status, view battery charging status and detect faults without stepping out and paying too much. Save your time and money. [12V BATTERY TESTER] This battery tester automotive is for all 12V charging systems, including regular flooded, AGM flat plate, AGM spiral, and GEL batteries for vehicles, forklifts, hybrid cars, Pickups, Boats, RVs, Motorcycles, Travel Trailers. [6 LED INDICATORS] The battery checker is perfect for home and commercial usage. Six LED lights show the status of the battery and alternator. accelerate your engine to 2000 rpm when the green light is lit, the charging circuit is ok. Battery check: indicate the percentage charging in the battery. [DURABLE DESIGN] The reverse protection function prevents burnout caused by misoperation between the (+)battery post and (-)cable terminal. Pure copper wire and clip make excellent conductivity and high sensitivity. The no-slip design makes you are able to use it flexibly even wearing gloves. LED quantity:6 (2 red, 3 green and 1 yellow) Material of wire:0.06 square millimeter copper Max. voltage and current:13.9V 15A Length of wire: 25cm/9.84in Battery tester size: 12.4x5x1.8 cm/4.9x2x0.7 inches (approx) 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. Note:Due to different production batches, the printed labels are different. Color:Grey Material:plastic Package Contents: 1 * 12V Car Battery Tester