YOJOCK USB C Tester USB Power Meter 2 in 1 Digital Multimeter 3.6-32V 0-8.0A Voltage and Current Tester, Type C Voltmeter Battery Capacity Volt Ammeter Power Bank USB Cable Charger Detector

The display is somewhat small. If you are trying to show lots of different parameters this forces the text to be small as well. Fewer parameters allows larger fonts to be used. You can scroll through the screens until you find one you like. Display is also multicolored which is nice.

This is just as useful as the cable testers, except for the chargers instead. Stop guessing if that wall wart is 1A or 4A, or have to break out the microscope to read the invisible specs on the side. Just plug it in to this and then to the device you want it to charge. Instantly know exactly how many watts it can put out, or if it supports 9, 12, 15, or 20V for various levels of fast or laptop charging. Once you have a baseline for a charger, you can even start using various cables in between to check if they support the power requirements themselves or if they are forcing the charger or device to drop to a lower current or voltage than they're capable of (yes, this happens). You can quickly identify trash-chargers, organize them by the power they'll support, or just generally troubleshoot if a device, charger, or cable is bad, incompatible, or just flakey. I love this stupid little gadget. Almost as much as the cable tester.

I love it. It displays comprehensive data information on its LED screen clearly with attractive colors. Voltage, Amperage, wattage, time, temperature etc. also shows in graphical log scale mode. Change the different display modes by pressing a small button on it. Amazing little device that isn’t cost so much either. I recommend this model if you are looking for a good deal and quality USB tester.

I love this thing. I was easily able to measure the REAL storage capacity and charging speed of power banks and other 5v items. I retuned a lot of power banks that grossly overestimated their storage.

Handy device

love it

I was using this on the day it arrived, and I used it in parallel with another brand that does mostly the same thing except -- this has more connections! I found it to be accurate in the tests I was running as it was in agreement with a multimeter and the other unit in use.The added connectors create convenience, and mine came in a little plastic box that is a great place to keep it safe with my other test tools when I'm on the go.I like the flexibility, the ergonomics are excellent, readability very high, and the connectors are, while not rugged, solid as expected. I will probably buy more of these, but for now I'm quite happy with the one in hand.

It worked for less than 4 months; after that, the device just stopped working in my case. I assume it was due to a small fall from my desk, so I don't consider this device to be durable.