[ACCURATE CAR BATTERY TESTER] BM310 battery tester offers you an 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, flat plate, 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. [ 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 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 () 6 LED Light Indicator Check before Charge: Battery is alive, "OK" to be . 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 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.