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