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1. It has high precision LM3914 analog voltage detection, users can accurately know the remaining battery power. 3. LED power indicator light, clear at a glance. 4. Suitable for lithium batteries, lead-acid batteries and other batteries, widely used. 2. The power display range is adjustable, and the display range can be adjusted according to the battery power. 5. The power display tester is simple to test and easy to use.