WL-133 DUOYI DY3015B BATTERY TESTER WITH PRINTER is an instrument used to measure the voltage and capacity of batteries. This device is commonly used in the automotive industry, solar energy systems, electric vehicles and other battery-based applications. The DY3015B model provides a precise measurement to accurately measure the voltage of the battery. It also has an integrated printer that can report the actual capacity of the battery via printer. This makes it easy to record and report battery test results.