12V Car Battery Tester, Alternator Tester Automotive,Battery Checker, Analyzer to Check alternator Battery Charging System,LED Indication 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! 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.