USB C Tester,KJ-KayJI 2 in 1 Tester Color Screen IPS Digital Multimeter(2024),Voltage,Cur,Pwr,Resistance,Elec,Temp,Capacity,Tme,Fast Charging,with USB Clip Cable Support PD2.0/PD3.0,QC2.0/QC3.0,BC1.2

This is high tech. User friendly. Compact piece of technology at your fingertips and quality is still there. Excellent display screen for voltage ,amps, milliamps and is an excellent quality meter with accurate readings. some things can be programmed for your personal taste of how it should be set. Many different screens. How many amp hours it takes to charge your battery or how many amp hours are left on your battery. It's extremely easy answers to all your electronic questions by reading the instructions to acquire the answer you're looking for. Has different languages but I forgot exactly which ones my apologies. Excellent value for the money. I consider this a must-have item for anybody that's into electronic troubleshooting and observing electrical input, output etc.Beautiful color screen, easy to read, small font. Well laid out display screen.Amazing piece of technology that works when you wanted to with quality behind it. Thanks

At first the amp readings were far off. My 1 amp devices showed as drawing nearly 3 amps. I created a test circuit on my bench to draw 0.5 amps and this device showed 2 amps. I reset it and now all is well. To reset: single press button a few times to get to the Settings screen. Hold button down a couple of seconds to enter that screen. Once there, single click your way down to option #5 - "Default Set..." It will be the top option on the second Settings screen. Hold the button down on that and you'll get an "OK!" confirmation. To be safe I did the same on option #6 - Clear data. Maybe there were previous settings or old data from a prior customer or from the manufacturer during a test.I'm not sure what settings or data could cause the amps to be so off, but in any event, after doing that, the readings check out from my bench tests. I took my test circuit all the way down to 18mA. Using the included - and much appreciated - alligator clips, this device bounced back and forth between 0.01 and 0.02 amps. Well done for such an inexpensive and tiny little device!This is a very cool little instrument. I was surprised to see the screens showing the line graph readouts over time. Lots to explore and use with this. Well done to the manufacturer.

This thing does a good job of measuring USB power, but as others have said, I'm leery about connecting it with my phone with a dodgy app which communicates with a server in China, so I just use it standalone.Be carful. The dummy load can get rather hot!

We usually don’t ask what happens when we plug in the cable because we can’t. Being able to see which source is charging, which two sources actually produce the same amount of power, discovering my c-connection to my phone doesn’t actually transfer more than my micro USB does to my tablet .. etc… is great. And, of course … “Is that cord still working? Next stop: Figure out if that one car USB port really does have no power.Where, it really helped me, was with my ACER Switch 7 tablet style laptop. Slim, powerful, runs hard, but It needs aux power after 4hrs. Because it wants 19.5v (a PC standard), but most of the c-style chargers/batteries output +/- 20.5v (a Mac standard) it usually rejects the aux battery I bought for it. Turns out that rejection is brief, temporary and over just a few cycles. It’s not a perfect solution, but I found that after a few quick replugs, my battery quickly loses that top voltage and starts and is actually transferring 19.5v at 1.6A. Not showing the symbol I expected on the PC but it’s charging! Who knew?We’re used to flying blind and relying on what they give us, but being able to see what’s going on with this affordable device is great.There is a little c-port in the armpit of this device that didn’t work for me, but I quickly realized I didn’t need it anyway. I can do the same thing using the 4 main plugs. Bright readable characters for the main information, lots of subordinate info in tiny characters should you care. This little tool is very affordable for what it does. I didn’t realize how much I would use this, but now that I have it, I’m not giving it up. Simple, easy to use tool that I’m using a lot.

I use this for testing USB-C chargers, battery packs, and cables. I love that it gives you so much information - not just V and mA like the Satechi, but watts (which is the most important metric overall!) and also total charge (mAh) and total energy (mWh), elapsed time and more. I used it to know that my Pixel 2 XL wasn't getting 9V from the USB-C charger I was using; replacing that gave me much faster charges.The UI is a bit wonky; the "W" for watts is some kind of strange character, but you get used to it. To reset the charge time, total charge, and total energy, each one is a separate reset, so to reset all you have to double-click, then triple-click, then quad-click. The "input" and "output" USB-C ports are labeled backwards, and the "manual" (even the new one) is pretty hopeless. "Resistance" is a bit weird, it's just V/I as far as I can tell, a bit meaningless for this application. (It won't measure your resistors.) And I wish it had a display mode that showed watts in larger font. But on the good side, it's accurate, the display is clear, it has all the info you could want, I like that you can flip it upside down, and also it remembers your settings between uses which is great. And the multiple inputs & outputs are super useful. You can test pretty much anything USB-related with it. Although, it says it can test batteries: not really so much. It comes with alligator-clip cables which you can hook to a voltage source of 3V or more (i.e. not a AA or AAA battery) and it'll measure voltage, but not under load which is what a battery tester needs to do. That's not why I bought it though so I'm good with that. On the other hand, if you have a USB AA/AAA battery charger, you can hook this tester into that and measure the total charge sent to the batteries you're charging.