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Unpacking my Keweisi KWS-V20 USB Tester

I’ve started to taking out from storage some of my electronic related tools to start on some personal projects. Lately, I’ve had the need to measure voltages and currents on USB devices and it’s a pain to setup circuits just to test them.

After, searching the Internet to find a solution, I’ve found out about this small USB tester that allows easy measurement of a USB device’s voltage and current. It also has other features that allows a user to measure other parameters like milli-ampere-hours and the elapse time. This became very useful, for instance, in cases where I want to find out the charging capacities of lithium batteries.

I bought one online and after about couple of weeks my USB tester arrived. The USB tester is actually able to measure between 4-30 volts and 0-3 amperes. You can also measure the charging/discharging capacities of devices in milli-ampere-hours and the duration of the measurement.

The Keweisi KWS-V20 USB tester has a male USB Type A connector as the input on one end and a female USB Type A connector as the output on the other end. It has a reset button on the upper right side when you’re looking at the LCD display.

When powered on, the LCD display on the tester displays four values. On the upper left hand corner, the measured input voltage is displayed. The lower left corner displays the measured current. On the upper right corner, you get the elapse time. While on the lower right corner it displays the charged/discharged amount in milli-ampere-hours.

Just to check if the USB tester is working, I’ve connected my wireless charger to the USB output port. The current reading was updated and the phone on the wireless charger has started charging. After a couple of minutes, the display for the time and mAH readings has been updated.

It looks like the tester is working. Will post more later on different ways to use the USB tester. I’m looking forward to using in my projects.

Gerry Ilagan

Gerry Ilagan is into mobile apps and WordPress development at @speeqs. He loves to write about electronics, the Internet of Things, mobile phones, and #crazyideas.

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