The Cartman Car Battery and Alternator Tester is an excellent device to check battery condition and alternator charging. This device is great value and easy to use and will enable you to check battery charge with ease and simplicity. The LED display indicates the condition of 12 Volt batteries. Customers have praised the high-quality clamps on the device and the convenience of the alternator tester. This is a great gadget if you want to combine ease and value. It’s also super light weight and perfect to keep in your car.