ANCEL BST100 12 Volt Digital Car Battery Tester Vehicle Alternator Condition and Charging System Analyzer - Black<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Portable and lightweight， designed for 12 volt lead acid batteries ONLY.</li><li>6 LED lights indicate Alternator and battery state， check before charge and overload display.</li><li>Alternator state - accelerate the engine to 2000 rpm， when the green light is on， the charging status is ready.</li><li>Battery check - indicates the percentage charging of the battery.</li><li>Charged state - when green light is on， the battery is already fully charged.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41V9MBiUB6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41msdg4EHDL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51J1oyWfBHL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/616tsp6BdFL.jpg" noproxy>