You can use this to confirm the quality of your phone charger.
If you want to buy original charger, this device guided you to buy a good quality one.
All you need do is to connect it to your phone charger ans dee if you can get a littleabove 5Volt. Then connect you phone to this and see if you still get 5Volts, if yes, that must be a good charger.
You can also use it to determine the capacity of lithium ion battery or power bank
Current Voltage Capacity Tester USB Tester .
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