YOJOCK USB C Tester Power Meter 4-30V 0-6.5A Voltage and Current Tester Meter, USB Capacity, Temperature, Working Time Ammeter Voltmeter Power Bank Charger Detector (Classic Version)

YOJOCK USB C TESTER. Fast delivery. Securely packaged. Easily readable, uncomplicated display. I've used this for only a few days. It's shown some interesting results in the changing voltage and current levels from different chargers to sundry connected devices, so, for its performance so far, I'll give it five stars.

Nice instrument to use and gives plenty of useful information.

Love this little device. I had a lot of chargers and cables that all seemed to perform differently with different devices. With the aid of this tool, I was able to definitively ascertain and verify the capabilities of each charger and cable once and for all.

Gets the job done with accurate voltage and current readings, but the build quality feels a bit cheap. It’s functional for basic testing needs, but don’t expect a premium experience. A decent option for occasional use.

Works fine on my iPad pro showing charging at 15V 1.2A. The other meter I've got has a short USBC plug for some reason and won't connect to the charger when plugged in. Which is why I got this one.

Looks good, does its job.

When heading out for a multi-day backcountry hike these days there's rechargeable lights, phones/gps etc. to consider. So portable solar becomes a thing - with quoted outputs ranging from almost plausible to hilarious. There's no magic here. Bigger panels receive more sun & produce more power but the circuitry also (seems) to be a thing. If you've ended up dissatisfied with a panel and bought another (and another, or more!) how do you know what they are doing for your lamp etc? So, for me at least, in steps this device. Jack in your phone, rechargeable lamp etc. to this and the other end goes into your panel - under cloudy, sunny conditions etc you then get real data about how your panel interacts with your kit and the watts it's actually delivering. Invaluable. Recommended.

I am puzzled by this device. Being digital, it should be accurate to within 1% or so, but I get a different voltage reading compared to my older Type A USB Tester. I have checked the accuracy of my older tester against a voltmeter with accuracy +/- 0.06V at the 5V level. My older tester says 5.15V, my voltmeter says 5.13V, so I am happy that my old tester is accurate. I now connect a Samsung EP-TA50UWE charger (output 5V 1.55A) to the mains, and my old tester to the USB A port. It reads 5.15V again. I now connect the YOJOCK USB C Tester via a USB A to USB C cable, so the two testers are in series, and the YOJOCK reads 4.96V, versus 5.15V on my old, accurate, one. I then connect my Samsung Galaxy S8 phone to the YOJOCK, which now reads 4.60V, versus 5.15V which is still showing on my old tester. This is over half a volt difference - 10%. Something is wrong here. I get similar readings from several other chargers. Invariably the voltage on standard charging reads well below 5V. I ran the calibration as per the instructions as well. As a final point, it is now indicating that the phone is charging the charger..... The phone is 74% charged and is being charged. So I have no idea what is going on. I hope the seller or YOJOCK can explain this. Otherwise, I will return the item.

I bought this to replace another meter that worked great except it had a fixed USB-C tip. Accuracy was great and it was very easy to use, but it is inconvenient to attach to devices and its tip broke off within a week. This one is identical except it has a shot flexible USB-C cable instead. And that makes it just perfect! it is now easy to attach it laptops, phones, and other devices, and it is safely attached and I do feel it has no reason to break off. The meter works beautifully, showing accurate and realtime data regarding the power flowing though it. it also calculates the power drawn over a specific time period (click and hold the switch to reset and start a new session), and it is remembered even if you unplug the meter.

I use this for testing power with microcontrollers and while I cant speak to exactly how accurate it is, it does seem to be accurate enough for my use cases. I like that it shows mA/A, mV/V, mWh, mAh, and run time with a simple button to reset the timer. Really useful for getting power draw and battery run time estimates. It even shows the direction the current is going with little arrows.

Semble bien fonctionner et reste opérationnel avec le temps je recommande !

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Very interesting to see what's really happening over that USB-C charging cable (e.g., devices switching between 5/9/12 V during one charging session). I picked this product because of the attached cable: more convenient than a male plug end that some competing products have. I will be testing the capacity of my powerbanks; the device tracks total Wh that passed through it, even with interruptions.