AreMe 2 Pack USB-C Adapter with LED Display, PD 35W USB Type C Female to Lightning Male Connector for iPhone/iPad/iPod, Support Voltage and Power Smart Display (Transparent)

These are super simple to use unlike the more full featured USB test gizmos, and far cheaper to boot. Generally all I want to know is "how much wattage is flowing to the device?". And these tell me without any muss or fuss. I usually all I want to know is "is this thing getting 5, 10, 20, 60, or 90 watts" kind of thing. I don't care if it's getting 59.1 watts instead of 64.5W. I have some of the complicated USB testers, and the numbers on these agree to within an acceptable tolerance - they're easily accurate enough for my needs.I don't know if similar gizmos are available for lighting or Micro-USB connectors, but I'd like to find a couple.A few quibbles that are not worth knocking down a star: - I wish the W/V indicator used a different color for each (say blue for W and red for V). It would make it much easier to distinguish which metric is being displayed since the characters are necessarily quite small - I easily get confused about the orientation of the reading - some sort of bar or underline indicating which edge is the "bottom" of the numeric display would be helpful. I've added my own in the form of a thin bit of colored tape - I don't see a need for a decimal point to sometimes show up in the W reading - I'm fine with getting a precision of 1 watt and it would make the watts display easier to read for me

USB charging rates are a mystery to most of us. With USB-C cables and power supplies, you could be charging at 2 watts, to in excess of 140 watts, depending on the equipment used. You might have a high power USB wall charger and a high charge rate capable appliance such as a portable power station or notebook computer. But use the wrong USB-C cable and you may only receive a charge rate on the low side of the range and not know it. With these adaptors, you can see directly what your charging power is in voltage and wattage. I have two other LED display adaptors like this model, but they only show the wattage. Plug any USB-C cable into this adaptor and plug the adaptor into the appliance to be charged and read directly the results. While these two adaptors only work directly with USB-C, they are portable. That is, they can be switched around as necessary and used with any USB-C cable. Sometimes I don't care about the numbers, only that a good charge is occurring so that I can go do something else knowing that a charge is taking place.My only dislike is the display readability. By necessity, the digits are very small. But they are also dimly lit and the "V" and "W" labels are very small and hard to differentiate. The included close-up pictures don't really show this readability challenge. But that aside, these are very useful tools if you want want to be able to monitor the level of power being delivered by your USB-C.

This is an interesting little device that gives you an idea of how much power is going through the USB cable. Useful to help estimate energy usage (if you're charging off of battery) as well as know when a device has completed charging.

The media could not be loaded.  I bought it at a curiosity to see if it would work the voltage fluctuates and you can watch it work and you can notice it will go to 4.9 4.5 5.0 and that’s the voltage go into your phone when it’s charging it’s not gonna always stay at 5 V but most the time it’s pretty close to it and you can watch it while it works

First off, the display on these is VERY dim. They're really only usable in low-level indoor lighting. Even under my desk lamp, which is has an 815 lumen (60W-equivalent) bulb, the display becomes almost impossible to make out. Sunlight? Forget about it. Since the display is the whole point, and you'd want these for on-the-go measurements, I can't give this a very good rating. It's a shame, because it does well in just about every other way.Measurements on this are very accurate, agreeing fully (down to the tenth of a volt) with my other measurement equipment. Wattage is also pretty accurate, only being a watt off at the full 140W limit. The display flips between voltage and wattage, showing volts for five seconds and watts for ten. It will stay on volts if there's less than ~1.5W being drawn. The PD light comes on whenever voltage is 6V or higher, regardless of the fast charging protocol in use (which is how most operate, and still useful.) Amps are not shown, only voltage and wattage.All pins of the USB-C connection are passed through, and it adds about 20 milliohms to the ground and VBUS connections (presumably for powering itself.) It does get slightly warm when lots of power is being drawn through, but nothing alarming. I had no issues passing data or video through.I find it difficult to recommend this device, which is a shame because it works well aside from the one big flaw. If the display were brighter so it could actually be seen in normal light, it would be a great product.

These are fine. They're accurate enough, down to a tenth of a watt. Nice and small, easy to plug and play. The display is the big drawback. I have a few different testers and these are by far the dimmest. I couldn't imagine trying to read these in moderate daylight for example. I also don't like that they flip between volts and watts automatically every few seconds; I would like it a lot more if there was some sort of toggle or button.