LCD battery tester Ansmann. LCD battery tester Ansmann for 12/24 V to check the battery voltage. Simply plug it into your vehicle's cigarette lighter to quickly and accurately test the performance of the battery, alternator and charge regulator. Can be used to monitor 12V or 24V batteries, alternator and charge regulator Shows the current measured output voltage of the car battery accurate to 0.1V With bright, high quality LED display for IP20 voltage indication.