The name of tool is USB tester, it can measure Voltage and Current of USB port,
To use this tool is very easy,
Plug the input port of this tool to the USB port of the computer/laptop or USB charger.The output of this tool to be connected to the USB peripheral, Handphone, smarthone, flash drive, external hard drive, etc.
For easy to understand you can see the figures below:
In this example I put the USB tester between USB charger and my smartphone.
Voltage of this charger is read 5.03 V (with load ).
USB tester displaying the Voltage of USB charger |
For the model of this USB tester, wait for several second, to toggle/change display from Volt (voltage) to Ampere (current), and from Ampere to Volt.
The electric current flow from charger to my smartphone, the value is 1.05 A
USB tester displaying the Current in Ampere of USB charger |
I try to move and plug the USB tester to my Laptop.
The value is 4.86 V (with load/smartphone)
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The current flow from my laptop USB to the smartphone is 0.46 A
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You can try to your USB devices, The price of this small USB tester is very cheap, you can buy from online store or at your local computer accessories store.