USB Power Meter Tester, A3 USB Tester, Type-C Current and Voltage Monitor, USB Safety Tester, PD Battery Capacity Meter, Digital Color LCD Display Multimeter

This USB power meter (likely the Color A3 or similar model) has quickly become one of my most used gadgets. It's an incredibly handy and portable analytical tool that provides crucial insights into the performance of my USB chargers, cables, and devices. Setting it up is simply plug-and-play. You just connect it in-line between your power source (charger, power bank, etc.) and your USB device. The clear, bright color display immediately shows you key metrics like voltage (V), current (A), power (W), capacity (mAh), and energy (Wh). Some models also track data lines or have additional features. I've used this meter to: * Test if chargers are delivering their rated output. * Check the quality of different USB cables and see which ones support faster charging. * Monitor the power consumption of various gadgets. * Troubleshoot charging issues by seeing exactly what voltage and current are being drawn. It's a fantastic way to identify under-performing chargers or cables that might be slowing down your charging speeds or not providing stable power. The portability is a big plus – I can easily toss it in my bag and use it anywhere. Highly recommended!

I just wanted a simple power meter for my USB devices to see what kind of power draw they're actually pulling. I picked this one because I thought that it would give a bit more feedback on Power Delivery settings. Unfortunately, it is only capable of identifying QC2 and QC3 chargers. Everything else comes up as unknown. The instructions are terribly translated if you can find them. So far, it has worked with the cables and chargers I've plugged it into. I'll update if I do run into any manufacturing problems.

I really like this unit, I use it often. Interesting what I've learned. For one thing (surprisingly) there is a big difference in USB cables. Most cables won't fast charge, others vary in current. For another thing, when a phone says it is fully charged, it really isn't. Current continues to flow for another half hour. I have a multicharging unit, and there is a big difference with which socket I connect to. With 2 or more connected, the charger won't charge at high speed (9v). Unit has everything you could possibly want to measure.

I have two of these now. The voltage difference is around 0.01 volts between them with neither being precise, according to a Fluke meter. But that’s fine. The software is different on the new one, with better looking line graphs over time. The displays are otherwise the same, plenty bright and easy to read with adequate options. These consume about 0.015 amps at lowest brightness. Both units refuse to power up when a USB-C PD cable is providing power as input, regardless of what is connected to the outputs. I mostly use this as a “hub” to charge devices from a 12v battery that steps down to 5v. It allows me to monitor voltage and current. I don’t really use the myriad of other features these have.

This is the 4th USB tester I've purchased in the past 2-years. The first tester was great, but was stolen, the next one worked great to, but some acetone got spilled on it. The 3rd tester was returned due to minor operating inconsistencies, The A3 USB Tester, purchased on 12/31/2023 is consistently losing connection, and for the first time this tester came with no adapters, instructions. the require downloading, but most are in Mandarin which does nothing for me. if that's not enough, this one cost about twice the price.

Rally neat device, cool but basic functionality in 'creative' package. The big screen is used well and a huge advantage over others. Rock-solid even after running for weeks at a time. Does not have measurement data output, which would be nice. A real five-star product.

There is a note on this device's advert page that for the USB-C input to allow it to power up, a PD-compatible load must be connected first. Well, I tried doing so, by connecting a Pixel 7 phone (definitely PD capable) as the load to the USB-C output, but the device will absolutely not turn on and the phone does not charge with this full USB-C "pass-through" connection. It is odd, because with a USB-A charge port, a USB-A to USB-C cable plugged into the thing's USB-C input port, the thing does turn on and devices do charge. It just refuses to work with a full USB-C-everywhere cable connection. That is unfortunate since the best charging arrangements nowadays are all exclusively USB-C. So, the device is largely un-useful except for charge supplies that originate from USB-A ports. I do not know if this device is just defective, I don't have another to which I can compare it. I, too, had a hard time finding the user manual, but I followed one reviewer's advice and "googled" the phrase "bangood hannqi usb tester manual" and I did get a downloadable link as the first result. But, that user manual did not provide any guidance on how to get this non-working funcction to work. In fact, within that user manual, it did not even include the blurb about needing to plug a PD-compatible load into the device to get it to turn on, as is the comment on the actual advert page. Of course, even with that helpful hint, I was unable to make the all-USB-C connection of this thing work. UPDATE: The "fails to work with USB-C" is not true, and I'm not sure if it is a shortcoming with this device or with the cables I am using. I have found that - despite everything said by people about USB-C being insensitive to the orientation of the plug in the socket - that this is electrically not true. While the plug will physically insert in either orientation, the behavior is definitely not the same. I found that with my particular setup of all USB-C cables, I had to ensure that the orientation of the cables on the input and output USB-C ports on this device had to "match" (i.e., if I flipped one connector, it would stop working, but if I flipped the other connector also, it would then start working again. I looked into this and internet consensus seems to be that not all cables are fully compliant to USB-C standards, and that this sort of thing can happen with "cheap" cables that don't have all symmetrical guts in their connectors. I was surprised though because one of the USB-C cables I am using is probably from my Pixel phone and the other one is a fancy beefy "240W PPS" type cable, and both cables exhibit this behavior where this USB measuring device will power up in one direction but not when the connector is reversed. So, I can get this thing to work with all USB-C cables if I mess with the cable orientation of both the input and output cables. I don't know if both of my cables are "el-cheapo" in that construction or not, but this experience has really shaken my confidence in the whole notion of USB-C being a universal solution to cable compatibility headaches. Giving these guys back a star, I don't think there is anything wrong with this device (only the instructions, as most seem to agree).