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The ZB 2L3 device is a battery capacity tester module that can measure the real capacity of batteries with a maximum voltage of 15V. It can be used to test various types of batteries, such as lithium-ion, lead-acid, nickel-cadmium, and nickel-metal hydride. The device has a micro USB power supply and a digital display that shows the battery voltage, discharge current, and capacity in ampere-hours. The device also allows the user to set the termination voltage for the test, and automatically stops the test when the battery voltage reaches the set value. The device is easy to use and can help the user to check the health and performance of their batteries.