The CTEK BATTERY ANALYZER tests with high accuracy the condition of all types of 12V lead-acid batteries including Wet, Maintenance Free, Ca/Ca, Gel and AGM. Easy to use it provides fast, and easy to understand results. Operating voltage range is 8 –15V with a test range of 200–1 200EN. Simply connect the clamps to the battery and follow the step by step instructions on the display. The easy to read display gives clear information on the condition of any 12V lead-acid battery and advises what action is required. With no need to disconnect the battery from the vehicle, the patented technology used by the CTEK BATTERY ANALYZER is safe for the user and vehicle electronics. It is reverse polarity protected, creates no battery loads, heat or sparks. The CTEK BATTERY ANALYZER features a 2 - year warranty.