Poyiccot USB C Adapter LED Wattage Display 140W, 40Gbps USB C Extension Adapter, PD 3.1 Type C Power Meter Tester with Digital Display Type C Extender for iPhone MacBook Thunderbolt Charging, 2-Pack

The media could not be loaded. USB C is a very complex form factor and is most confusing connector of all. So is the power delivery through USB C, literally like in Power delivery as in PD (which actually stands for a defined standard) and or QC, PPS or just 5v etc. Attempt to unify the power supplies so that same power supply can be used for every device from a Bluetooth headset to a laptop ranging from 5v/1w to 48v/240w it has become quite complex. Every thing in the charging or power path plays a role including the most mundane cable. Every component talk to each other.This power meter is something that you can put between a power supply or hub and the cable connecting to the device. I helps you read the actual power consumption in real time together with voltage. This unit pleasantly surprised me and this is why:> Small dongle size that you can use with any cable, important with some devices that need special cable.> Power meter: It reads both volt and wattage in real time and the readings are quite accurate for this type of device. It read voltage from 2.8v onward. I tested it from 2.8 -to 28v and up to 100w delivery without any heating. It read in either direction, you can put it at supply or device end. It doesn't display what power level the device negotiated but the real time consumption. Voltage tells you whether a 15watts is 5vx3A or 15vx1A. It helps you determine the issues or limitations of the chargers/power supply etc.> Data line: Most power meter cables support only USB2 connections. This cable supports a complete USB4 data lines, that means you can use it with any USB4/ Thunderbolt hub, specially the powered one. More importantly being and extension type dongle it must and does have both sides of D+ D- lines connected. This is a common problem with many USB4 extension cables.> Internal Resistance / Shunt: Being a small dongle you won't expect much internal resistance. However, power meters have a shunt resister which is common design practice for current measurement. Measuring the IR gave me about 10 mohms on the VBUS and 30 mOhms on the ground, that tells me they used the shunt on ground line. It may be a better choice because most cable struggle with VBUS IR. THese IR values will add to your cable IR.You must keep in mind while using this with a high current device that your actual cable is a good quality otherwise the voltage drop might creates problem for some sensitive devices. OnePlus phones which uses higher current than the PD limit of 5A, limited the charging current slightly lower with this in series, but still connected WARP charging.> E-Marker: Being an extension type dongle this should not have an E-Marker and it does not. This allows your actual cable E-Marker to control the current that it supports.> Display is quite dim, but I personally like it because I do not like blazing displays on these devices it becomes a distraction.Overall this is one of the better USB power meter that you can use with any cable with full USB4 data line (no missing one side D+ D-) and voltage display. It is reasonably priced.

Adds fun to daily boring charge routine. I wanted a way to create visibility on how much power is flowing through my charge sessions and also to verify the power in/out from my charger. Having these added to my existing charge cords is an extra geek points. So far, it has been accurate is measuring watts flowing. it even provides the voltage reading. build quality is good as well. The display is a little bit on the dim side, and wish it was brighter.

Of the two units, both are a little dim and hard to read, with one of the unit's decimal point being too dim to detect with the naked eye.The decimal point is... kind of important.

The image displayed for this product shows a clear housing. I received housings made of dark plastic making the display way too dim for practical use. Very hard to read.

I have to admit that I ordered my pair of Power Display adapters on a whim, thinking they might be interesting. And they really are. The tiny LED display cycles between volts and watts. When using a USB wall adapter with rapid charge capability and charging my phone, the display initially showed about 9 volts and 11 watts. It then throttled back to 5 volts as the phone neared full charge. Charging the same phone by plugging into a USB port on my PC, the charge rate showed as 5 volts and 2 watts.So, the power values appear to make sense. I find the display small but readable (I have to use reading glasses).One odd thing that happened was when I initially tried this with the USB wall adapter, the power to the phone would cycle on and off. As if I was plugging and unplugging the cable every second or so. It did not happen when plugged into my PC. But then when I tried the wall adapter again, the cycling problem was gone and the phone charged correctly. The cycling has not occurred again.

These are good alternative to power hubs with LED that shows the power consumption of connected devices. These connectors are more portable and can be used anywhere with any USB C power source. Using it with my NVME external drive, it didn't really affect the data transfer rate of the drive. There was only about 1% fluctuation. In terms of accuracy, I dont feel these (adapters or power hubs) are very accurate, but they give a good indication of how fast the devices are being charge/consuming power.

Ordered these to test some of my old and new chargers and cables, and look at the readings. Though you are provided a reading, I found it to be off a watt or a few watts. Since it's not rocket science, not a big deal, however if you depend on accuracy, these are not for you. Compared readings with other cables, chargers, and/or battery banks with display readings to compare, and the other devices were consistent among them and this was usually a bit off. For the price and not worried about accuracy, may be for you.

I can take these anywhere and add them to any C cable to see what the electronic is taking as far as energy. They are bright to read and look great.