Good: Very useful to check real-time voltage, current, capacity and charging temperature while charging. It is also necessary to check whether the battery can deliver the specified capacity. When disabled, it saves memory from last use. If it is activated, it can be deleted by pressing the button twice. It supports devices with QC2.0, QC3.0, BC1.2 (battery charging version 1.2) and Apple voltage range. You can switch to three different display screens by simply pressing a single button on this USB digital power meter. She seems very accurate. Bad: no instructions. I've spent some time playing around with this to find out all the information that is available here. I wouldn't know if there are other hidden settings. Additional Info: It's amazing what you can do with just one button on this device. - Pressing the button once takes you to the next screen - Pressing the button once and holding until the beep resets everything - Pressing the button twice resets the capacity (Cap:) - Pressing the button three times resets the energy ( Ene:) - pressing the button four times resets the time (Time:) - pressing the button five times toggles the setting next to the time: Off/AO/Manual - pressing the button six times changes the language from Chinese to English. The setting next to the clock on the second screen has three modes. :-Off [the device works without interruption] -Automatic Off (AO.) [the device turns off after it detects a power failure].-Manual [the device turns off after the specified time].Automatic Off (AO .) and Manual is very useful when you don't want the device to draw a bit of power here and there. e after fully charged. Especially if you want to extend the life of your lithium-ion device or prevent your battery from draining. To set it to "AO". (from "OFF") press the "AO" button five times. flashes, and then wait for the device to beep. To manually set it to a specific time (from 1 to 24 hours), press the AO button five times. flashes, press again, "24" flashes. Pressing the button once decreases the time by 1 hour (24, 23, 22, 21, etc.), pressing it twice increases it (21, 22, 23, etc.). Since there is only one button, you have to go back to "24" to be able to select "AO". or "OFF" again. Below is the data that can be displayed on each of the 3 screens. The 1st screen contains 6 entries. Left (Top) - Voltage - Amps - Run Time. watt hours. The second screen has 8 entries. Left (top) - negative contact (V-) - positive data contact (D+) - negative data contact (D-) - positive contact (V+) right (top) - resistance (O) - temperature (°C) - time - amps Es There are 4 entries on the 3rd screen: Top-Voltage(V)/Current(A)-Capacity(Cap)-Energy(Ene)-Time(00:00:00)/Auto Shutdown(AO. )
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