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find a nice and cheap USB color display tester with communication function
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RD Tech:
Today, we will publish new product USB color LCD display tester meter.
https://www.aliexpress.com/store/product/RD-USB-2-0-Color-LCD-Display-Tester-voltage-current-meter-4-digit-Voltmeter-Ammeter-Temperature/923042_32845522857.html
User manual and PC software download link: http://www.mediafire.com/folder/0jt6xx2cyn7jt/UM24
Simple video to show this : https://youtu.be/nIZSb0DJExc
There are 2 versions, UM24 (no communication version) and  UM24C (communication version by Bluetooth)
there are many advantages: 7 main interfaces, 10 kinds date detection, operation help button, PC bluetooth connection, 10 data groups to store, Micro USB cable impedance measurement, voltage and current graphing…
Now as old rules, at first published 4days, selling at lowest price 9.99 usd (UM24)? 12.99 USD (UM24C), after 4 days, back normal price more than 13 USD ( UM24), 17 USD (UM24C).
In the market, same quality and color LCD USB meter cost more than 20 usd. So please check it, hope you like it 
If you don’t like it, please ignore me
Have a nice day
Best Regain
Glen
BTW, home page : https://rdtech.aliexpress.com/store/923042
Power supply page: https://rdtech.aliexpress.com/store/group/Power-Supply-module/923042_252253169.html
scorillo47:
Very nice device.

I succeeded to connect the Bluetooth interface and it works (including exporting data to clipboard)

Bluetooth connectivity seems to go down after a few minutes though when the screensaver goes dark. After disabling the screensaver (to zero minutes) seems to work for the last 10 minutes or so

Thanks
scorillo47:
Quick question - what is the serial protocol on ports COM3/COM4? I tried to connect to it with Putty and didn't seem to work

Thanks
RD Tech:
could you make a video to show this problem
RD Tech:
what's your computer ? did you use the bluetooth adaptor ?
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