YOJOCK USB C Tester USB Power Meter 2 in 1 Digital Multimeter 3.6-32V 0-8.0A Voltage and Current Tester Meter, Type C USB 3.0 Voltmeter Battery Capacity Volt Ammeter Power Bank Charger Detector

I did pay for this myself and it isn’t part of the Amazon Vine Program. I do have one of these under another brand but needed a 2nd one and this looked the best value at the time. These do seem to be generic, with some having a brand name on them and others don’t. As I test a lot of charger and cables, these are really great for seeing what is happening vs. the spec. Where this differs from similar products is that you can go from USB-A to USB-C and visa versa. I have another design that, if you plug one end into a USB-A port, then the other end must also be plugged into a USB-A port as well. Personally, I find that too restricting. You can change the display arrangements but some are tricky to read due to the amount of info it’s displaying, that is unless you’re up close. I tend to focus predominantly on a setting which shows me Volts, Amps and Watts at that time and ongoing. It is easy to use and the display is clear, if a bit small sometimes. You even get a Micro-USB adapter included and a simple plastic storage case. Pricing on this specific design does tend to fluctuate quite a lot depending on the brand, I paid £16.74 for this one, but have seen these (not this specific one) for £25 upwards. For the price, I thinks it is decent value and highly portable. I did run a comparison test compared to the other one I had, they are exactly the same device, and the readings were the same on both. I hope you found this review & photos interesting, informative, and useful. Thanks for reading.

Useful little gizmo for checking USB voltage and current. Flexible options for checking various combinations of USB ports. The display is small but good enough to read how much voltage is available at the source and how much current is being drawn. Used it to confirm my in mains socket USB ports were all working properly. There are some other functions including a mini scope showing ripple. Overall works well

It lacks a USB C socket for input, so was useless with a USB C, plug-ended lead, like a USB C PSU with permanent cable, like for Raspberry PI, or when it is not practical to directly plugged in to a USB C power socket, because it's the wrong place or otherwise impractical. It seem that I will need to find/make a USB-C socket to USB-C socket adaptor, with PD support, for such situations, which was annoying, so I dropped 1 star! Update 2025-12-02 Correction: I discovered that the confusingly labelled "Type-C OUTPUT" can be used as a power input (e.g. a charger) and "Type-C INPUT" can be use as the power output (e.g. a mobile), so the suggested need for adapters was incorrect. The recorded duration was useful to see how long a device took to charge.

For the price, this is a fantastic piece of kit. It shows all the information you could ever need, and even plots graphs of load over time. I used it to check whether a lithium battery charger was pulling excessive current (and hence overcharging the batteries) when plugged into a higher powered USB C port versus a lower one (it wasn't, so it was fine). It will come in useful for other things I am sure. You do need good eyesight to read the screen which is only a couple of cm across.

This a great tool. I was to get the volts/amp off of my laptop with this

Purchased this to test the USB-C ports on my Mac and phone after experiencing charging problems. The tester provides clear voltage and current readings, which made it easy to identify whether the fault was with the cable, charger, or device port. Having both USB-C and USB-A support is very helpful as it works across all my chargers. Straightforward to use and very informative. A useful diagnostic tool for anyone troubleshooting charging issues.

Does exactly what it's supposed to do, solid and portable.

OK, so mine had a dead USB-C input and I’m returning it. Aside from THAT it works ok. What you don’t realise is that it’s quite small and if the charger socket (USB-A specifically) is the wrong way up in the charger you’re testing, you’re probably not going to be able to see the display, which faces downwards. So a short extension cable to allow you to turn the display visible would be a welcome inclusion in the package. Also, you can test whether a supply is working with just the tester but you’ll only get a power reading if the tester is between the socket and the device.

Funciona a la perfeccion, para saber la carga de diferentes cargadores que tenia por casa y en la oficina, asi puedes comprobar si realmente cargan a la potencia que dicen. Da mas informacion de la que necesito, es muy completo y esta hecho con calidad, buena compra.

Fonctionne parfaitement. Très intéressant.

Great little USB meter. Provides all the information that I needed to test my PD charging devices. Would highly recommend.

Very convenient USB power meter that allows you to get all power readings with any conceivable USB connector. Great form factor too.

Underbar sak som gör sitt jobb väl. Där ser man om det drar någon ström eller inte laddar alls. Bra verktyg.