USB power meter/tester thread - YZXStudio, Power-Z, RDTech and more.

PC Communication is managed by “KotomiApp” application which already draws a very nice graph for you, and CSV export is like this:

This file is generated by Kotomi PC software
Time Voltage Current Energy Capacity Energy Proportion Capacity Proportion
0day00:00:00 14.6970V 2.3494A 0.0959Wh 0.0065Ah 0.12% 0.12%
etc etc…

KotomiApp screenshot:

I’m also inserting some links for people to quickly find where to buy popular meters, can you help with suggestions which are less than $20?

So far I got these:

Quick links to popular power meters:
-$20 and less
-RUIDENG UM24: USB-A/Micro, QC, Bluetooth (opt), Offline logging: Banggood
-Kewesi: USB-A, QC: Banggood
-Daniu: USB-A/C, QC, OTG: Banggood

-Eversame (Ironically same as many other generic testers but from Amazon, with prime): Amazon

-$20 and up
-YZXStudio ZY1276: USB-A/Micro/C, QC, PD, Bluetooth (Opt): Ebay, Banggood
-AVHzY CT-2 / Kotomi Premium: USB-A/Micro/C, QC, PD, PC Comm, Offline Log: Amazon
-Power-Z KM001: USB-A/Micro/C, QC, PD, PC Comm, Offline Log: Banggood, Ebay

And probably cheapest here (zy1276 <$39): https://www.fasttech.com/search?yzxstudio

Do you have a link for that software? And for that matter, one for the meter too :)

I think that app will work with my power-z km001 as well...

And thanks for taking my suggestion ;)

The AVHzY version was the one cheapest for me with prime shipping, and I figured they might be the same compared to kotomi premium and the larger power-Z, but with the aluminum plate (which is awesome).

https://www.amazon.com/AVHzY-Multimeter-Current-Detector-Capacity/dp/B073R7YRM9

However the Power-Z KM001 software doesn’t detect the CT-2, which could mean the same viceversa. Kotomi software can be downloaded directly from AVHzy.com

There's an upgrade to the RuiDeng UM24C :

more info : https://www.banggood.com/Bakeey-UM25C-USB-2_0-Color-LCD-Display-Type-C-Voltage-Current-Cable-Resistance-Tester-Measure-p-1267797.html

Looks like they added Type-C ports...

Anybody got some decent manuals for the Power-Z KM-001 and KT-001?
I found one for the KM-001, but that's so densely translated that making sense of it is a bit of a chore.

For the KT-001 I can only find the Chinese one, which presents the same problem when I translate it with google Translate :)

Since the AVHzY CT-2 is supposed to be equivalent to the Kotomi / Power-Z KT-001, perhaps you can use that as a reference?

download link for AVHzY is here:

Hello there!

I been looking for these testers and can’t decide which one would be best for me. To the first question… With Power-Z KM001 they advert that nice windows app, which makes nice graph. Is that app compatible with also KT001? Or maybe even with other brands than Power-Z, like AVHzY CT-2? Also, if I understood right, none of those mentioned above has bluetooth? So if I want also bluetooth, would my options be YZXstudio 1276 or WEB-U3 SE? And what are their difference?

Thanks for help!

Edit: Does Power-Z KT001 support same firmware as AVHzY CT-2?

The apps are not compatible, as far as I know.
Regarding the bluetooth : I don't know if the WEB-U3 has that function.
Mine (WEB-U3 MFI) doesn't have it.
And as for the YZXStudio 1276 make sure you order the right one (with BT). I ordered mine without, as the logging it provides is too basic.
I own all of the meters you mention, except the KT-001, that one's still on the way.

To answer your second question :

From the manual :

Hint: The model name can vary from one provider to another. So far, KT001, Kotomi Premium, CT-2, UT100 are provided, they have the same features and share the same manual, PC software and firmware, it is not necessary to concern about that.

Thanks for the info. I think I’ll get KT001 or CT-2 and forget the bluetooth idea.

I would also agree with dodge_911, regarding Bluetooth functionality — check if that USB meter has a good app to make use of the BT function.

I also have the ZY1276 without BT, since I read that the BT only outputs values (much like a serial data cable) — as YZXStudio does not offer own software (not sure, but if they have, it likely is only a serial logger software) to graph or control the ZY1276.

The RD UM24C with BT, I also got this one, the software is a bit basic — mainly the software (I’m referring to the Windows software, I hadn’t tried the Android app) just shows all screens (in the USB meter, one has to browse thru multiple pages to get all the info) into one screen (in Windows software, all info can be displayed on the screen at once). Plus the software also allows logging the data (I haven’t tried this functionality much though).

But I generally use the ZY1276 and RD UM24C as stand-alone devices (not linked to PC/smartphone). I use the EBD-USB+ USB meter/load tester if I need to test USB devices. EBD-USB+ does not have a screen, it requires Windows software to show the info, but it graphs those data nicely, and also has some useful controls (eg. for testing capacity or for monitoring USB devices, and then recording the data unattended until user-defined thresholds are reached (eg. monitor USB charging until current falls below certain limit; or load test a battery until the voltage falls below certain limit, then stop the test automatically). It’s not Bluetooth though — it has to be connected to the PC via micro-USB cable.

I'm using almost the same setup here for my YT channel.
UPM's are used standalone, for visual purposes.
For graphing I have the ZKE-TECH EBD-USB's, which I timelapse/screenshot every 10 seconds.

Although, I am thinking of incorporating the UM24C and POWER-Z UPM's windows apps somehow into my workflow, they really do make nice visual representations of the data.
But I'd have to upgrade to a newer windows version, as I'm still running WinXP on my little nettop dedicated to testing.

All methods of logging have their use. YZXStudio was the trendsetter with many functions for a UPM, but they have been surpassed by other manufacturers that offer better software logging solutions.
But that doesn't mean I'm not buying any more YZXStudio UPM's though, they have a great UI and as stated previously, are a great visual aid in my testing.

On another note, you could maybe consider a YZXStudio ZL-1100 combined with the app someone here on BLF made?

What do you think of these?

QC2.0/QC3.0/MTK-PE Trigger USB Tester Induction Quick Charge Voltage Detector Current Capacity Power:

JUWEI QC2.0/3.0 Automatic USB Tester Voltage Ammeter Quick Charger Power Bank Voltage Trigger:

HKJ did test them one/two year(s) ago:
Test/review of QC3.0/2.0 trigger | BudgetLightForum.com
Test/Review of USB meter: QC2-3-MTK-PE Trigger J7-t | BudgetLightForum.com

I've been messing around a bit with some newer UPMS, I've got quite the collection now :

I'll be posting 4 UPM vids on my YT channel this coming May...

Great collection!
Very cool :smiley:

Will you post the results readable too?

Nah, kids nowadays don't read anymore ;)

Great, I’ve got two of those. i also have these two:

And it’s bad, because things said in videos don’t appear in search engines as text. So many things out there you wouldn’t find until you reach the appropriate video most times by accident.

I watch videos only for entertainment - knowledge need to be consumed through written words for me :wink:
Reading is much more easier. :nerd_face: