diymore USB Tester USB Meter Tester Voltage Current Tester USB Battery Checker USB C Voltage Current Voltmeter Amp Volt Ammeter Detector USB Mobile Tester USB Cable Charger Detector LED Display

Tested up to about 85W (20V, 4.25A), and it seems to be working well. (Turns out my Anker charger doesn't maintain 20V as strictly as my big laptop brick, haha.) The meter can be hooked up in either direction and still works.The display looks quite nice in person, very colorful with good contrast. I've had no issues with glare or viewing angles. Clicking the button switches between two sets of displayed specs (see photos), and double-clicking flips/rotates the display. Settings are remembered between plug-ins. You can also long-press 3 seconds to reset the timer and cumulative specs. (This is all in the included manual.) The button is loose and rattles a bit, but seems to work fine.

I first bought the higher price upgrade without pigtail, flow did not work both directions like this one. The V/A/W features on this device are small but bright, very accurate and can easily distinguish what cables and/or power sources (incl solar panals) are suitable for your needs. I was surprised at the wide variation of power supplied from some cables and power blocks. This unit is hard to beat for the price and unlike the upgrade model the usb-c ends actually fit the devices correctly. I highly recommend it.

Why did you pick this product vs others?:I purchased it because I use solar panels to charge power banks while at the same time the power banks power my garden fountains. I understand that my solar panels need direct sunlight but I wanted to know if I was getting the power I needed during the day so that the fountains would continue to work during the night. As soon as it arrived I tested my solar panels and the meter showed that the voltage and wattage was enough to charge the power banks while the pumps are running. This is a great little test meter and with so many other usb c charging devices I can varify that they are working properly also.

There are some better meters out there for about $20 that have more USB connector types on them that provide some additional info, like PD/QC power profile, but this one is smaller, less expensive, and less complicated. It’s fine when you need the voltage in use, the current draw in amps, and want a mAh/mWh capacity estimate based on V x I over time, and you’re either only using USB-C or have an adapter.I have this simple inexpensive meter, and a much more expensive $90 meter/analyzer for more elaborate measurements. But this cheap one gets more use.

I purchased this to test the output of some of my charging blocks and it worked perfectly, the displays are bright and easy to read. There is a single input and are duel outputs for multiple devices

I use it to test the portable batteries and power outlets I review, really neat device. Useful for finding ideal sunlight for my solar panels that dont have a built in power display

Very handy. This - in addition to a similar USB-A multimeter - should be in every traveler's briefcase or toolbox.Being able to monitor charge voltage and/or current is important, not only for device health, but can also be a life saver when trouble shooting or reviving 'dead' devices. I have an endless list of devices that have been saved as friends were about to dump them, when the sole issue was that they were not taking a charge - and friends were not aware of that.

Update: I received my replacement and like the earlier one, it worked just as it should. Unplugging it multiple times, so far it has stayed together. Any extension coming off a soldered connection with a PC board is a potential weak spot. This little unit should be used with this in mind. Careful plugging and unplugging in a straight line, will help extend the life of the connection and this tool.I'm raising my star count..Giving 3 stars for now, until I see how this issue is resolved.The meter worked as far as power and charging readings. I really liked it... until I went to unplug it and the metal plug detached from the body and stayed in my phone.I'll update and change the rating if I get this resolved satisfactorily.