Klein Tools USB Power Meter, USB-A Digital Meter for Voltage, Current, Capacity, Energy Resistance ET900, Orange

This Simple and Logical to use, brilliant bit of kit, allows you to check and confirm the output values (Voltage, Current, Capacity, Energy and Resistance) of USB A and USB C charging ports, whether that be USB Wall Sockets, USB Chargers or Battery Power Banks.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!

Good bit of kit. Seems to work well and feels well made.

A well designed USB power meter, it’s nice to have a unit with tails (cables) as it makes it easy to view the screen when plugged into difficult to reach sockets.Build quality seems good and measurement is accurate. I do wish however they included a power calculation and displayed the current load in Watts rather than just amps and volts with Energy.

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.

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.

Particularly useful to check USB items can pull the required current. For a item to pull full current you must know the USB adapter or charger is capable of providing that current or above. For example some adapters rated at 2.0amp may only provide 1.85 amp. The usb item you plug in could be rated at 2.0 amp but pull more. If it does it requires more. Ie 3 amp adapter.

Used to verify output of usb sockets.

Shocking build quality on the device I received. The USB C input was pulled straight off the pigtail cable when I removed it from a power source. This was the very first time I used it.