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I love these USB Doctors, now I can REALLY know when my iPhone and iPad are charged up all the way to 100% charge, not what the indicator says. Just Because the iPhone/ipad says its full, doesnt mean its fully charged. With this device I can see if it still actually charging itself up all the way full. Plus its really fun way to know if a device is charged all the way up. I got some other battery powered equipment and it lets me know when they are fully charged up also. And I know that cause the meter goes to zero charge flowing thru it. So yeah get yourself some of these, put a sticker on the back with your name on it, so it doesnt walk off if you use it at work. I just showed them how to get them for their very on, on eBay for a few bucks. And if they didnt want to do that,I could sell them one for 10 bucks, no one wanted to pay 10 bucks, so they bought their own. Its a great piece of equipment to have with you at home and on the road. A real plus is it turns one usb plug into to two usb plugs, because they are built in. For the price get yourself several of them, you wont regret it. Its Really Neat-O to have. Read full review
Verified purchase: Yes | Condition: New
Very poor accuracy on current. I purchased two. With both units connected in series both show 0.00 A. The current required to drive the displays is not indicated! When connected in series with a resistive load and a two other current meters the units read low. E.g.: Actual current 0.73 A, indicated current 0.67 / 0.67 A Actual current 0.41 A, indicated current 0.32 / 0.35 A Actual current .175 A, indicated current 0.08 / 0.11 A The accuracy of the voltage reading is better but not good. E.g. With actual voltage 5.22 indicated voltage 5.28 / 5.29. I opened one unit and the quality is horrible. There were stray solder lumps stuck to the board near areas of hand work. The display units were not seated properly on the board. The vendor did not reply to my question about accuracy. Don't waste your money!Read full review
Verified purchase: Yes | Condition: New
Price was so low, I bought 3 so I could give 1 to both of my children. Checked voltage accuracy on all 3, and it was reasonable for the intended purpose. Didn't check the current accuracy but reported values were similar and within expected range. Have 2 output ports so can also be used as a splitter. My only problem is that the display looks similar upside down , as happened when plugged into the back of my computer, and is easy to misread. Already needed to use it on a recent trip. Can't see much inside the cover so can't really tell the quality of the materials, however, they work and are a good value given the low cost.
Verified purchase: Yes | Condition: New
This current voltage charging detector is very easy to use and is very handy to check batteries, cords and chargers. It is much simpler and easy to connect and use than a multi-meter is. With this unit there is never a doubt if the cord or charge are in good working order. It saves us a lot of time.
Verified purchase: Yes | Condition: New
I've bought 4 of these testers from 9enjoyshopping . One for myself and one for each of my married children. It indicates the voltage and amperage passing through any USB connector. I'm an engineer and I couldn't even buy the components for the cost of the unit. Very good value and works reliably. The only cons I see is the lack of instructions and poor packaging. They are in individual ESD bags but then tossed into a non-padded envelope for mailing. Great value; everyone that works with or on computers should have one.
Verified purchase: Yes | Condition: New