MakerHawk USB 3.0 Tester USB Power Meter 3.7-30V 0-4A Voltage Tester Multimeter USB Current Meter IPS Color Display Voltmeter Ammeter Charger Tester AT34

This is a very nice USB tester which seems to be quite accurate. Large display that is easy to read. I like the various option available, like being able to rotate the display 180°, voltage, amps, watt hours, etc. I will probably end up ordering another.

I received 2 of these for Christmas 5 months ago. I am in no way associated with the company, I just found a good product and would like others to know. Features: you can turn off the screen, change between °C and °F, it records how much power was used, you can access multiple records of power usage, data transfer is unaffected. It reads between 3.6V to 5.4V (so far), however the screen turns black when usb-c fast charge exceeds ~6V, though it is very temporary and limits 9V to 5v usb-c. In general, the amps (blue) read between .001 to 2.8, yet to see 3+. The higher the amps are, the faster the charger. I use it to determine how much power many different chargers use, both in amperage and watt-hours of capacity. I also use it to find the best angle to place my usb solar panel, which is often straight up on a cloudy day. It is seated well in the housing, not wiggling or sliding around like my green thumb drive(hence the glue). It also comes with a usb plastic cap for the male end, and a folding plastic case, though it’s durable and I carry it without the case to save space. This is accurate, i tested it with a 22Ω+ 10Ω resistor in series to make a higher wattage 32Ω resistor, along with an ohms law calculator to compare. The meter read 32.2-32.4 ohms, which is very respectable (usb cable has a little resistance) and the other math checks out as well. I read how some have inaccurate meters, but I guess it’s been fixed since then. Overall, if you want to check how fast something charges, what voltage your charger is at(safety shut-off), how much power is consumed, and even the resistance of your charger+battery, then this is the meter for you. (Yes, that does seem kinda staged like an ad, but it is a good product)

The MakerHawk USB 3.0 Tester measures USB port direct current voltage, direct current, milliamp-hours, milliwatt-hours, and temperature in degrees Centigrade. It is simple to use: just plug in the USB device under test in one end and the Tester in the PC's USB port and the results are presented instantly on the built-in color display. Is it accurate? Probably accurate enough for most requirements. The price was low and the value was sufficient. As I said in the headline, it does the job, what more do you want? I recommend the MakerHawk USB 3.0 Tester for these reasons.

Works great, just plug and play to monitor charging progress of batteries of some portable radios. Used it to troubleshoot a balking charger. Fair price, good value.

This gadget is both fun and functional for tinkerers and curious minds. There is quite a bit of usefulness packed into this device, which has exactly one control. I originally wanted something like this to keep tabs on current flow when I'm charging devices. This does that, of course, but there's so much more one can learn from. I quickly realized some USB ports are better at keeping up a proper charging voltage than others while under load. With this I can now get a measure on how much charge capacity things have. Now I know that my 2200 mAh USB battery is actually a 2350 mAh battery (surprise!), and how long it will run the cat's water fountain when the apocalypse comes. So much to learn! I do wish the current readout was a different or brighter color, as it's hard for me to see that in my environment, but this is a minor concern.

Great tech tool

Have you ever plugged your device into a charging source and just couldn't figure out why it wouldn't charge well/fast? Is there an issue with your device? Is it the charger? Does the charger really output what it says it does? Well, we have various models of chargers all over the house and several devices to charge (from iPhones to iPads to wireless headphones), and the chargers/ports seem different (some really weak). With this device, I can tell for sure. It's super easy to use and read. I'll be going through through all our power stations (and probably ditching a few) at this point! Great little product (especially for the price!).

Love this thing. I like being able to test the output and input to some of my devices to make sure they are getting what they need. easy to use. easy to read the voltage.