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

Works great. Needed it to check usb ports on golf cart

This tester is helpful. I use it to test USB ports. It will also show you the amperage of small devices Will is also helpful in some occasions. A simple device, doesn’t feel too cheap.

The English instruction manual is almost useless, but once you figure out how to use the device, it works quite well. Sometimes the capacity count resets simply by plugging it in (rather than waiting for me to hold button II), but that hasn't been much of a problem. Just consult the Amazon product page to learn how to use it.

I'm using this to test and verify amps/volts on various USB chargers and cables. It's already helped to weed out a flakey USB cable I suspected was drawing less watts than expected along with a AC cube charger that has seen it's last days. I have a rather large collection of power banks where the manuals or specs have disappeared. This tool verifies the output so I can make sure to use the right one for the application needed. Some things I need to rapid charge, while others can take their time. One often overlooked feature is the display. I don't care much for LCD displays anymore as I find most weak and hard to read. This is not an issue with LED. Accuracy appears to be within the same range as a multimeter, but much easier to use. I have no complaints, so five stars.

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.

It delivers a quick and accurate voltage reading. I've checked over a hundred USB ports so far and its worked great.

This does exactly what I wanted it to do. It measures voltage, current, power, etc for a variety of charging things (solar panels, phone charging, science projects, etc.)

Works as described. Good buy.

The USB meter gauge is very accurate and easy to use. It has resolved many issues with USB power adapters, when a message on the device screen states: "you need a better charging source." By comparison with good USB power adapter, I have isolated many that were way below 5.0 V DC and lacked current capabilities from continuous use. I also realized never leave a USB charger plugged in the 110V AC without a loaded device to charge.

電気がどのくらい流れているかの確認用。表示が大きく見易いので助かります。もう使い初めて5年位経ちますけど異常は無いですね。

Excelente producto y de buena calidad, gracias

シンプルで便利

Es bueno aunque no intuitivo en su funcionamiento y lectura de mediciones.