USB C Power Meter USB C Tester, USB Multimeter 4-30V 0-12A Voltage Current Capacity Energy Power Digital Tester for Tablet Chargers Power Bank Cable

I'm quite impressed with this little device. Although I don't usually *need* to know the value of charging current and wattage, it is interesting to monitor, and it may be useful for troubleshooting in some circumstances. The readout is bright and clear. I like the fact that the display orientation can be swapped with a simple double press of the button on the back. (Press once to change display details, twice to reverse orientation, and long press to re-zero the data.)

Voltage verification

For those interested to understand your device charging characteristics, this is a nice compact multimeter. Simple to use.

And is cheap.

It's a nice little unit. Emphasis on "little". This thing is small, which can make reading the screen in some orientations more difficult. But overall it is easy to use!The main downside I have found is that it does not pass through USB data, so some applications won't work. For example, you can't use it to see how much power is going to your phone while also using Apple Carplay or Android Auto. And you can't use it to see how much power a USB device (like a Webcam or mouse) is drawing from your laptop. But it works fine for most charging or power-bank related things. Even so, I am removing one star for this flaw.

This is such a great accessory as it really lets me know how well various chargers are at providing current to my devices. It’s especially good for when I’m in someone’s car and I can see what their car gives whether through their cigarette lighter adapter or a dedicated USB port and I can then pick the one that gets the most juice.

Simple, easy, and does what it's supposed to. I don't have the tools to validate that the readings are correct, but they seem correct, or at least very very close, based on using high quality power cables and chargers (ie. 60v charger with high quality cable reads 60V on this).

Display has lots of information. Note that some of the characters are quite small. Basic voltage and current are easily read. The overall unit is very compact.