Rui Deng UM34C USB Meter 

Good observation Rick. If I'm not mistaken, when the device displays "graticules" like this, the device is actually presenting the trends of the elements, in this case Volts and Amps, over a given period of time. The values seen in the corners could represent the MIN & MAX of the respective measurements. That would probably be my best bet since even the voltage reading was off too.

We all need at least one more meter. What branch did you serve in? Navy here.

could not serve had bad asthma wanted to it was navy my family went in i live just a few miles from greatlakes naval station that should be where you took basic training i ended up becoming electrician but we still use military

Do it! Id love to see your video.

learnelectronics I'll try my best, just wish i had more time!

I downloaded the app grom the card in the box. It was a mediafire address.

Both Banggood and AliExpress have links in the mediafire.com domain although the directories where they are pointing to are different. Banggood has "/folder/q2b8h079hpywq/UM34" which in fact points to an UM25C directory while AliExpress's link is "/folder/5c877rc21tp1p/UM34" which is really the UM34C Android app v1.0.3. People will need to pay attention to the documentation file (.pdf) in the UM34C directory since the download link in the document itself is the same as provided by Banggood, which is for the UM25C and not the UM34C.

Yrs

Should brown out at 4.5V for the UM24/UM34 and 4.0V for the UM25. Its better to get both the UM24 and TC64 which will cost the same as a UM25. For most the accuracy of the UM25 is not needed.

Good to know, thanks

If you need the Green version (UM24C), check on Aliexpress. In fact they have the 24,25 & 34 models. I'm referring you to AliExpress for the only reason that the documentation I downloaded via the link provided by Banggood, "Factory technical support and conctact way .docx" actually refers to manufacturer store on AliExpress. BTW, AliExpress provides a proper link to download the app for the UM34C whereas Banggood link redirect us to the files for the UM25C, despite their link states it's UM34.

I dont know.

Paul Dorland As per the information on the Banggood site the app is available for Android only, version 5.0 and above.

No, and it's a sign that this app should never be used on anyone's device. It's not even on official google app store.This thing most likely a spy at least.

It wont be on my site, feel free to order wherever you wish.

@@learnelectronics they owe you. I did.

They are (somewhat) sequential.

If we wear our Sherlock Holmes investigation suit we could potentially conclude the following : [UM] could stand for "USB Meter", the [2] or [3] could probably refer to "USB 2.0" or "USB 3.0", the only thing I can think of as for now for the [4] is the fact that the device has 4 USB ports, but this is only a guess. Finally, the [C] is somehow a bit more obvious, it would indicate the presence of the bluetooth communication board on the device. Keep in mind that this is only my personal deductions, nothing official. Now I'm taking of my suit ! ;-)

SimpleEnough2k9 Sounds good to me Mr. Holmes.

I put my suit on but couldn’t find an app for it on my 8 plus. Hmm, I think I’ll need my hat and glasses now. 🤔

John Hasty Don't forget the pipe.

You know, the app is not required.

I understand your concerns about installing apps via alternative or "non official" sources. Under the actual circumstances, I wouldn't be so much concerned about it. Actually, distributing apps via the "Play Store" or "Apple Store" doesn't mean that they will be more secure. Simply look at the permissions the Facebook app is asking for ; putting your phone on a bench at the park, unlocking it next to a glowing "Take what you want !" sign, would pretty much look as safe to me ! It pretty much covers your "red flag" concern, doesn't it ? The UM34C app is asking for the "Phone" and "Storage" permissions. I disabled the "Phone" one and only kept the "Storage" one to save the "*.xls" file and everything is fine. If you're still concerned that the app you're using might spy on you, simply use the app in Airplane mode, so nothing leaves your cell. Beside that option, considering that quite a few devices these days can be controled via Bluetooth of Wifi, so why not invest on a small tablet, dedicated to experiments ? The overall problem here isn't really the security but how the people are using their phone. The real purpose of a phone is to make calls, not to store your personnal information, credit cards and all the data you want to keep "safe". Speaking of safe, are you absolutely sure that your data is safe when stored on a cloud ? You'll probably run like a chicken without a head if you find out the truth about it, believe me ! Distributing apps via alternative paths is not unique. Some UNI-T devices can be connected via Bluetooth but their app isn't available on Apple Store nor Play Store. Does this mean that Uni-Trend app is suspicious because the manufacturer is using a different distribution platform ? Loto-Quebec, in Canada, can't use Play Store to distribute their app because the Play Store regulations does not authorize games of chance and gambling apps although they allow crappy applications filled with invasive advertisements, go figure ! Saying that because it's not available on IOS it's a good sign to not touch the app at all is almost saying than any platform other than Apple is worthless. I'm sorry but Apple screwed enough people as of now therefore I'm not considering them as a reference whatsoever ! If there is an alternative to IOS, I'll be glad to take it !