DROK USB Tester, USB-A USB-C 2.0 Multimeter Dual USB Ports PD QC 3.0 with Color LED Display Battery Charger Monitor, 7 Modes Capacity Voltage Current Power for Laptop Power Bank Solar Panel

I've always been curious about my USB ports' charging/output capability and device current draw, but until now I didn't have a way to test/monitor it. This little device is plug and play. Right out of the box, it displays the USB voltage and current flow as soon as it's plugged in.The device itself plugs into a USB "A" plug (large, rectangular), and provides TWO USB "A" ports, so that one or two USB devices can be plugged into it at the same time. Output port 1 supports charging AND data transport, while output port 2 only supports charging. The device shows the total current draw of the device(s) currently attached. A push-botton provides several other measuring/monitoring modes, but thus far I have not used any of them. I've used this device with AC/USB wall chargers, PC USB ports, cellphones, wireless headphones and a number of other USB charging sources/destinations with great success.Note that the device supports the typical 3 amp continuous USB supercharger rate, and can actually handle up to 10 Amps of current, but only for short periods, as its circuitry is not designed for continuous high current operation. Up to 3 amps continuous is just fine, though, and is typically the max most USB devices deliver/consume.I've been quite pleased with other Drok products, and this device is no exception. I'd happily recommend this product to anyone who wants/needs any power provision/consumption info for just about any USB port/device.

DROK makes great products. Things you didn’t know you needed, or EXACTLY what you needed at very affordable prices.With few exceptions, excellent build quality (doesn’t “feel cheap”).ABOUT YHE COMPANY AND THEIR PRODUCT-Their devices frequently have many features, maybe beyond what you needed included but that’s just it; A great Value!AND, if you’re a casual DIYer you could read up on the stuff you didn’t need it to do and Learn something. I’m well-trained and paid for what I do. Yet every job/client I do typically has an added bonus of some pearls of wisdom for me, or others the next time. Knowledge is Power...Pun intended ;)When I’m looking for a meter or other similar device, I ONLY shop the DROK products. The instructions coming with this product are excellent (see below for more on that in general).THIS THING is great to see current flow, check your charge cables, it’s NOT a way to discharge a battery, and doesn’t really work effectively (for the lay-person) to see charging rates. It’s best for voltage, live load, draw.Nite on cables-I have some ISB cables that are wired weird. They will lower but not transfer data. Some do the opposite. Some have product-specific circuits or chips. You might throw away a good cable. Use this to sort things out.Now, let’s address some of the other reviews I’ve read-A-Reviews should be about the product and not the shipping, Amazon itself, etc.B-Every product ordered, from a 737 to a pencil can have a bad one off the assembly line. Don’t review-shame the seller until AFTER you attempt to rectify things with them.C-Several people report that it’s inaccurate, or never reads any different values.This is actually what it should do, in a way, depending on your intended use. Most modern devices (more and more every day) have “Smart” charging. They regulate the charging to preserve the lifetime of the battery itself. It doesn’t pull full power all the time. That smart charging also helps when you are using a spare battery bank on-the-go.Do you have an iPhone? Check this: Settings>Battery>Battery Health and if “Optimized Battery Charging” is ON, that’s an example of Smart charging.Point a webcam that records at this meter. Go to bed. In the morning watch the recording in FastFWD and you’ll likely see some changes to the readout values.D-STOP taking away stars because the instructions are not written by a Harvard English Professor. Most products are made in Asia and the translation to American English is tough. We have words they don’t. Sometimes these read funny or totally crazy. “Insert the plug to flow watermelon to have extended happy value”. Seriously.If you don’t have a clue how to use something and your expectation is to open the box, plug it in, and Voila! Instant answer or problem solved without any understanding of what you’re looking at, you’re over-reaching. Don’t expect a single small sheet of paper to give you an Electronics Theory PhD.Do This- Read the entire listing product description. If THAT reads crazy, SO WILL the instructions. Move on to another seller.ALSO, search YouTube before purchase for HOW to do your project. Many times, this explains what to do with your new gizmo even before it arrives. In a recent case for myself on a client’s project that just would NOT produce their expected results, I searched YouTube. Not only did I find a solution, I discovered a new product I didn’t know existed, and, just as I describe above, watching a guy install the device completely made up for the “stick-figure” instruction sheet. I was ready to go when I got to her house.AND I came in well under-budget and looked like a genius. What I learned will repay me more than the pay on that 1 job.I even bought a 2nd one of those devices for my own home.

These usb-multimeters provide useful information on the voltage and amperage moving from your usb power source to an electronic device. I recently learned that some electronics are sensitive to your USB source's voltage. It is also useful to see if current continues to flow to the device after it is completely charged. It may not be healthy to leave an expensive electronic item plugged in it it continues to receive current, despite being fully charged and not being turned on. These devices are more useful to me than another far more expensive meter by a big name tool company. The more expensive device, by design, does not show any current less than .5 amps. That fact is in the instruction manual for the other item, but it is fairly well buried and definitely not evident pre-purchase. My big recent-year Galaxy phone is just one device that charges at .5 amps or lower, so being able to see the amperage on your devices was helpful. Your devices also had a nice bright screen and seemed reasonably well made for the low cost.