Klein Tools ET920 USB Power Meter, USB-A and USB-C Digital Meter for Voltage, Current, Capacity, Energy and Resistance

Works well!Confirmed that we had several dead chargers. Also helps to determine if it's the charger or the cable (elementary troubleshooting -- if you know the charger is working, but the device doesn't charge, it's probably the cable)!

Now you tell what all those different chargers output. This is a great tool!

This is a pretty nice USB power meter. I have a very simple USB-C only power meter that works well, but it doesn't have any leads, so can sometimes be hard to plug in. Also I wanted a power meter that also did USB-A. Klein Tools is a great brand, so got this USB power meter. It works well and has plenty of features. It has a lead on one of the USB-C ends as well which helps with device arrangement. But it does have a draw back: USB-C is generally the same plug on both ends, and as such the devices can determine which ones supplies power and which one is the sink. But this power meter in USB-C mode you need to put it in the right direction or you get no amperage reading... seems like a weird design flaw.

This USB power meter is very versatile, allowing me to test voltage and current in USB connections. It can measure voltage from 3 to 20V DC and current from 0.05 to 3A (USB-A) or 0.05 to 5A (USB-C). This wide range covers most standard USB ports, including Qualcomm Quick Charge ports. With it, I can measure and display important information such as USB port voltage, current, capacity, energy, and resistance, providing valuable insight into my USB power usage on various devices.My only minor gripe is that the meter instantly shuts off after a low current draw or power cycle, rather than retaining the data. It would be more convenient if it saved the last reading for a short period.It's important to note that USB Type-C connections operate with efficiency and safety in mind, meaning that the charger will only supply power when it detects a device connected to the other end. If no device is connected, the power meter will not power up as it doesn't receive any power from the charger. This feature prevents unnecessary power wastage and reduces potential electrical hazards.---Product: Klein Tools ET920 USB Power Meter, USB-A and USB-C Digital Meter for Voltage, Current, Capacity, Energy and ResistanceASIN: B07GXZHPVR

If you attach the meter to a USB C charger, you would expect it to work just like when you attach it to a USB charger or port.I thought my meter was broken and the USB C cable did not work.I used an Apple USB C charger for this test.Sure enough, nothing happened and the meter appeared broken on delivery.Since I am an engineer I ask technical question and make technical tests. (politicians and shrinks hate me)I asked, what if the charger has a sensor to detect an attched device to charge?The answer is, YES, some chargers do have a sensor to detect an attached device and they do not supply any current until a device is attached.This is true for more than just chargers.USB C is somewhat sophisticated.Once I attached a laptop to my Apple charger through the meter, everything worked perfectly.When using the USB C cable on this meter, make sure you have something attached that draws current or it will appear the meter is broken. (no current is supplied to the meter for it to work)The standard USB cable does not require that.

Ever wonder how much power your USB charger is actually providing to the device? I sure have. Place this device in line (plug meter into charger port, device to be charged into the meter) and it will immediately light up and report how many volts and amps are being consumed. It also reports how many mAh and Wh have gone across the meter and over what period of time. There's a minor restriction in that the meter has to be across either the USB-A or the USB-C side entirely, meaning you can't plug the meter into USB-C and then charge something that's USB-A or vice-versa. This is no big deal in practice, though. It even has a memory!All in all it's a very cool device and I'm glad I have it.

Edited four days after last edit: My replacement unit arrived. And it also will not read on the USB-C side. Again I've tried multiple different known-good power sources. Tested these same sources with other meters. Tried changing orientation of connection. Nope. The USB-C side died in the first one, and never worked in my second unit. Too bad. Lots of promise. Now down to a single star since it simply doesn't do what it is supposed to do.Edited a week later to reduce to two stars from four: The USB-C side input has failed after using to test about 20 different times. The USB-A side continues to work, but the USB-C side just remains dark. I've tried from multiple different known-good USB-C power sources. Nope. It is dead on that side.Original review with four stars: I didn't have anything to measure USB-C, so I purchased this mostly due to brand recognition. It is rugged and will likely last a long while. Even the cords are super tough and all ports and plugs seem high-quality. It seems accurate enough as compared to some of my other meters.The display is just too small for me. The tiny little text is tough to read for these old eyes. And the biggest miss for me is the lack of a Wattage reading. Of course I can do the math myself. But when both the V and the A are moving in real time, that math becomes rough! I'd much rather have a real-time Wattage reading so I know truly how much power is being passed.The memory feature seems like an odd addition. A button almost the size of the screen is dedicated to being able to save readings? I guess it could come in handy in some situations, but I think I'd rather just write down the readings than wonder which memory bank it is saved in.

It works well and with testing with my bench power supply it is pretty accurate. I have looked at some of the other reviews and they seemed to have a problem with the usb-c side, but I am not having that issue myself. Good product.