CARTMAN 12V Car Battery Alternator Tester, Test Battery Condition & Alternator Charging, LED Indication Description Features: LED display indicates condition, for 12V battery only. Alternator state check, battery state check, check before charge and overload display. 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 . Charger check: when green light is lit, charging is complete. Product Details: Brand: CARTMAN Power Source: Corded Electric Style: 12V Color: Dark Grey Item Weight: 1.6 Ounces Is Discontinued By Manufacturer ‏ : ‎ No Product Dimensions ‏ : ‎ 8 x 2 x 1 inches; 1.6 Ounces Item model number ‏ : ‎ TL120207 Date First Available ‏ : ‎ September 26, 2014 Manufacturer ‏ : ‎ CARTMAN Country of Origin ‏ : ‎ China Best Sellers Rank: #5,375 in Automotive (See Top 100 in Automotive) #11 in Battery Testers #11 in Battery Testers Customer Reviews: 4.2 4.2 out of 5 stars 8,936 ratings