USB Power Meter, USB-A and USB-C Digital Meter for Voltage
USB Power Meter, USB-A and USB-C Digital Meter for Voltage, Current, Capacity, Energy and Resistance, Klein Tools ET92
Hi-resolution LCD for clear visibility in environments with low ambient lighting
No batteries needed; powered by the USB port being tested
Durable cables to allow easy access to hard-to-reach ports
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| Mfg. No. | ET900 | ET910 | MM700 | NCVT-6 | RT210 | NCVT-4IR |
| Description | Power Meter, USB, USB-A Digital Meter for Voltage, Current, Capacity, Energy Resistance, Klein Tools ET900 | Meter and Tester, USB-A Digital Meter for Voltage, Current, Capacity, Energy, Resistance, Max Current, Klein Tools ET910 | Digital Multimeter TRMS/Low Impedance, Auto-Ranging, 1000V, Klein Tools MM700 | Voltage Tester, Non-Contact with Laser Distance Meter, klein Tools NCVT-6 | GFCI Receptacle Tester, Klein Tools RT210 | Voltage Tester, Non-Contact w/Infrared Thermometer, Klein Tools NCVT-4IR |
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|---|---|---|---|---|---|---|
| Mfg. No. | 55421BP-14 | 69401 | MM300 | MM400 | MM600 | 5139 |
| Description | Tradesman Pro Backpack, Organizer, Electricians Tool Bag, 39 Pockets and Molded Base, Black, L, Klein Tools 55421BP-14 | Multimeter Carrying Case, klein Tools 69401 | Digital Multimeter, Manual-Ranging, 600V, Klein Tools MM300 | Digital Multimeter, Auto-Ranging, 600V, Klein Tools MM400 | Digital Multimeter, Auto-Ranging, 1000V, Klein Tools MM600 | Canvas Zipper Bag, Klein Tools 5139 |
| Weight: | 48.1 g |
| Size: | One Size |
| Dimensions: | 2.54 x 2.54 x 2.54 cm; 48.19 Grams |
| Model: | ET920 |
| Part: | ET920 |
| Colour: | Multi |
| Pack Quantity: | 1 |
| Batteries Required: | No |
| Batteries Included: | No |
| Manufacture: | Klein Tools |
| Dimensions: | 2.54 x 2.54 x 2.54 cm; 48.19 Grams |
| Quantity: | 1 |
| Size: | One Size |
This power meter is very versatile as it allows 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 am able to 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.
I would be nice if it kept the data after a low current draw or power cycle instead of instantly shutting off.
It is important to note that USB Type-C connections operate with efficiency and safety in mind meaning the 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.
Thank you to the other reviewers who pointed out that the USB-C needs to have load on it prior to connecting the input to the power providing charger. USB-A is automatic. In any case, works well.
The only thing I would ask is if it can also provide Watts on the display! (it does provide mAH and wH, for watts, have to just multiply Volts x Amps). A bit expensive, but well worth the ease of use. Highly recommend.
Use it for the first time today to check multiple usb on a bus at work to find out which usb is bad, love make my job easier thanks you
Working with USB hardware for MS Teams rooms and other AudioVisual hardware this little tester has become a great addition to my test kit.
I don’t use this every day, but each time I have used it, it has saved me hours of time problem solving voltage and sync issues with USB-A and USB-C.
Great little unit recommended to tech specialists.
Use this on everything I have that takes USB charge. Nowadays lots of products have variable voltage and this little device tells you exactly what’s going on. Combined with a Kill-A-Watt wall meter, this is the best way to determine is things are really working as they should. USB charge blocks, power banks, cables, you name it. It reveals all. Also indirectly tells you a device’s native voltage. Found out one of my power bank’s native voltage is 15v. Amazing.
I bought a couple of these to test the ports on a USB power bank I am designing. Unfortunately, the load is not continuous. When you select aa current level, say 2 amps, it only applies the load for about a second and then turns it off. It latches the current reading so it appears to still be drawing current but, in fact, is not. I am sure this is the way they designed it but it was a surprise to me and not what I need for my application. The LCD layout could be improved. There are two sizes to display the voltage and current. The small size is too small and the large size results in the screen being too crowded.
After trying to figure out a random USB issue this little device had it solved in minutes. Found after 5-10 mins of a device plugged in voltage on the port dropped to 3v. Both front USB 3.0 on my PC exhibited the same issue. Found I had an issue with the header on the MoBoba small bit of soldering solved. 10/10 must have for anyone wanting to troubleshoot USB issues. If I were Klien I’d make a kit and have the input side and output have all the different USB ends needed in a small case. I’d definitely buy that as well.
The USB-C lead would not read my MacBook Pro USB-C ports. I needed to attach an Apple brand USB-C to USB-A adapter to the USB-A lead to read the Mac’s USB-C Ports. I also found it easier to read the USB-A ports in my Airstream travel trailer using a 16 inch USB-A to USB-C cable attached to the Klein’s USB-C port. The extra length is handy. Other than that it works as advertised.
This unit is really helping me to troubleshoot an intermittent iPhone charging issue (which Apple tech support were unable to solve); being able to check charging voltage and current in real time has allowed me to see when the phone is not charging properly.
Reading some of the negative reviews complaining about the unit not working on USB C, I think it should have a higher overall star rating; the manual clearly states that for the unit to work when using USB C it has to be connected to a downstream device. I suspect this may be a case of some reviewers criticising the product without having read the manual. It gets a very definite 5* rating from me.
I have used this meter for both USB A and USB C testing and both worked great. The trick on USB C is that it cannot be converted to anything other than C in the entire path. That makes testing some combinations tricker. Over all it does what it claims to very well.
Beside the data display screen there is the test screen which has 4 load levels to choose from.
I have had a charge port ‘fail’, and it dimmed the bedroom lights too which indicated a problem. Very rare, but you don’t want to sell an $80k 5th wheel hauler that has a plug that won’t charge your phone!
I’ve only played around with the pass thru feature so far, bought it for testing USB ports, which it does great.
This isn’t for everyone, definitely a techie gadget. I only wish it had its own power so that I didn’t have to wait for it to ‘boot’ before testing. Some RVs have several ports throughout.
I would buy again but I shouldn’t ever have to. It’s of good Klein quality. I like it.
One thing to note is that the USB-C and USB-A ports won’t cross over. Must use USB-C to USB-C, and A to A.
The max current it can handle is 100W.
Therefore it won’t be able to measure the 140W charger from the MacBook Pro 16″ with M1 chip.
I guess modern computer chargers require two way communications with a laptop. the laptop tells the charger what voltage and current to output, and also tells the charger when to stop charging.
So you can not hook this up to a charger without the laptop also hooked up, as the charger is not turned on and you will read nothing.
i guess the only way to read charging voltage and amps is with an actual laptop hooked up too.
I bought this tool (ET910) to help a client check that the USB input source his board is drawing, is capable of providing 5V 3A under stress conditions. In less than a minute, I simulated currents of 0.5A, 1A, 2A and 3A, and demonstrated that the input source isn’t capable of providing 2A or more (plus that the voltage will drop to 3V and provoke other failures). Such convenience! We quickly tested the other USB chargers he has and identified which ones he should use instead. Well worth the money!
UPDATE: It still works – be careful, if you are not getting current information you probably have the input and output reversed. 4 stars as I wish it would give you watts – and yes, I can multiple the V and A to get it, but would be nice not to have too.
A well made useful tool from Klein. It will test the supply from a USB socket, show the supply voltage and how much current is being drawn from the item being charged. Well worth the money, and essential for troubleshooting phone charging issues: already found a dodgy wireless charging pad that was intermittent.
If I had to complain I would do about the built in cords. They usually feel just a bit short, and they are always upside down for me, I have to twist the cords and hold the meter with one hand to see the display. I wish I could detach the cords, and or replace them easily.
This is what I need to check my USB ports after my external disk drive started acting up. I had placed it on a powered hub and things cleared up but after checking my ports that wasn’t the solution. A 5TB drive that has even 1-3% fragmentation slows down to kilobytes/second. Defrag’d and no issues but I have the piece of mind to know that the ports are okay.
It’s a nice unit and does what it is intended to do. I’m sure that the feature that I’d like to see is available on a more expensive model, and that is to record the peaks and lows during to know how voltage and current can vary.
The ET920 unit is a little smaller than I expected, being slightly smaller than a Credit Card and if it were just a cm or two longer and wider, it would be ideal but it’s not the end of the world.
The unit is robustly made, the screen is well lit and all data is clearly legible and accurate, albeit some a tad small.
The attached input cables are a little stiff and if the USB Socket is ‘the wrong way up’ (if that makes sense), you have to twist the cable to be able to view the screen but I’d rather that, than suffer flimsy cables and the pluses outweigh the negatives.
It does have its limitations, in that firstly, you cannot cross the cables i.e. USB A Input must be used with USB A Output (not USB C).
Secondly and this could be a Major Issue for some users, if the Input Charge stops, due to, for example, a low input voltage value, which would happen if the device attached to the output port has become fully charged, the displayed values are NOT stored on the device and are therefore lost.
Conclusion: To date, I’m impresses and Well Pleased with my purchase. It could be better but…..
I’ll update this review if necessary but to date, Highly Recommended!
So the tool is simple, plug into charger then output using either USB-C or USB-A. Then the device will start to capture capacity voltage and current.
The pros:
Easy to use and simple operation.
The ability to save data to the device.
Offers USB-C and USB-A input/output.
The cons:
If your charger shuts off when low output is detected, the data is lost. This is probably the worst part about it since most chargers stop output under low current draw.
Offers very basic information for the cost.
Overall:
It’s a good name brand tester, and if you care about that stuff then this is the one for you. That being said, if you don’t care about that then look at some of the alternatives out there. Most will keep their data on a power cycle and for that I lowered it 1 star. I use these to test portable chargers and I can only use these to test recharging of them since it doesn’t keep data after full discharge. If I have any issues I’ll update this review.
Expensive for the saize imo but does what is required with ease. I have been using mine to test PC usb ports along with the USB charging ports on some dual power sockets i have installed.