I did not find more detailed information about T-300,I have read the T-300 user manual，Its structure is similar to RT-200，The display part changes to liquid crystal dot display.
I think the extra cable on the bottom layer of RT-200,It may be connected to the oxygen sensor circuit board.
Because I saw the T-300 added the oxygen concentration test function
Can T-300 allow users to perform calibration and calibration? Through software?
If so, this is a good way
