USB Meter, DROK Digital Multimeter USB 2.0, Multifunctional Electrical Tester, Capacity Voltage, Current Power Reader with Dual USB Ports, 7 Modes

It was delivered on time. It was well packaged. It came with instructions that provided a general idea of what to expect. The features are as described on the Amazon listing (unlike others). It was simple to use. I like the cable attachment. It might be a little finicky, but I can find a way to rotate it to see the display unlike some of the units that plug directly into the USB port and you need to flip the computer over to see the display. Hard to say how accurate it is. At 5.5 volts It's within 1/100th of a volt of another unit I have. The current drops to zero when charging is complete. The power displayed is the product of the voltage and current. I can't really say how accurate the capacity is. I've used this about a dozen times with no problems so far.

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.

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

簡単に電圧、電流測定できます。表示も見やすく良いです。

Easy to use but the manual describing the various settings is not great. One setting called capacitance is a term often used in electronics and relates to electrical storage. On this device it is actually the amount of energy in mah (milliamp hours) that is sent to your device battery. This is actually quite useful as it shows how much energy the battery is still capable of being charged with. The variety of displays is really good. The unit has a short flexible dongle which makes it less likely to be damaged by bumping. My only real complaint is that most USB ports are oriented the same way and plugging this device into a USB port results in the display facing downward. The short dongle can be twisted to view the readings but it naturally turns upside down when released.