@Lambo Ferrari They just test there is no voltage protection, but USB devices can't short out (a protocol of the USB format). If you use a decent source of power/power bank then you won't have a problem. They shut off when charging is done and won't exceed voltage. I would suggest Xiaomi make the best power banks. For charging use decent makers ie wall adapters, not the ebay ones flying around some of them blow up!
@Lambo Ferrari There are different models out there are newer ones. Some will show higher voltages (ie quick charge etc) so look around and find what you need I made the video quite a while ago, there are variations on these testers out there with higher volt support
Useful review of these clever little devices (as of five years ago). I find I've still got charging cables that are very slow and were probably cheap - made for the days when phone batteries were accepting slow charge. I'll throw them! There are many USB cables out there today that are well made and will carry 2+ amps load. On Amazon they even show cross section diagrams of these high quality leads.
I passed on the background music, I did a poll and 90% say no don't want it. So I'll never use it. It can be passable at super low volume -most have it too high
useful, informative video with comparison features too, I learned there are inexpensive testers that will record capacity passed through as well. Thanks for this
They are useful particularly for devices with built in batteries, you can test the charge capacity. Or even just charging speed with the Drok, I use them quite often
I have the KCX -017 and it gives very good readings, tested with multi tester and its spot on, 100% accurate, not bad for £3 off Ali-Express, took 3 weeks to arrive.
btw the white one can only measure up to 19999 after it would roll over to 20000 it stops reading so i have to say go to 10000 and change channel and combine the 2
Some vary but yes it tops out at that level (maybe enough for some testing or most), there are newer ones out that go higher and do bigger voltages. Still these testers are pretty handy, thanks for commenting
If it's a windows PC it either works or doesn't you'll get a warning if files copied are corrupt. As far as speed goes varies hugely there is benching software for that
I have one meter from china which is very useful coz when battery reaches 100% it turns off automatically... very useful for whole night charging problem Do these have this function
@@MrBazReviews Thanks Sir, I will have to test it, trying to trick one that I use to power a camera to stay on, bit when the camera goes on stand by, the power bank stops and turns the camera on. An usb hub with an usb powered fan connected to it did the trick but I am trying to resolve it in a more elegant manner :)
Thanks, it is a good suggestion. To make a long story short, my camera (Nikon P1000) has an inbuilt protection mechanism that turns it off when not in used for +30mins, even if it is powered externally. As that causes that there is no draw from the Power bank, then this turns off too and when the camera wants to start again, there is no power (it is much longer than this...) so I am trying to get dummy the camera into doing something, and I have achieved that by finding a way to have it in standby, but in standby there is not enough draw to keep the power bank on (if that makes sense). I have ordered one hif these voltimeters to see if that draws the additional power to keep it on. If not, I may connect something else to it i.e. a fan, to see if that makes it. All this is to use the camera as a camera trap :)
I need to check USB ports inside vehicles to see if they are getting power and if they are able to read music of USB sticks. Would any of these be good for that, or are they strictly for charging purposes?
They can check power so if the port is working it will be showing near the 5V, the Drok is the most obvious one as this shows the voltage and drain so I'd use that for this purpose
hello can i measure the voltage of a quick charge phones ( 9 to 12 charging volt ) with KCX017 ,, because it indicates that the input voltage is 3,5 to 7 volts only !! thanks in advance
The KCX017 is 7 volts max, the Drok goes up to 10V so I use that for quick charge measuring. There are other testers out there, so just check the max voltage it reads some of them will go up a bit more
Hi,I have the keweisi but I noticed it doesn't work with small.current (below 200ma I suppose) and below this threshold,the capacity it's not updated.. Do you know if there is some hack for this?thanks
I've been using it quite a bit lately and my one is updating the mAh even at under 200 (albeit obviously slower than higher speeds) either you got a dud or something else is wrong
Mr Baz Reviews the mah field on the bottom left is updated correctly also below 200ma,but the capacity field on the bottom right does not,it not starts the calculation ,also the time field does not start,do you have the same behaviour?thanks
I also have two of those Keweisis. Earlier this week I compared their performance with some others and noticed some interesting differences. See ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-zGMDYU69ILs.html BTW. That Drok tester looks a bit like the Keweisi USB Detector, which I also tested.
