Yes; I suppose we should regard the T-300 as an evolution of the RT-200, especially as it takes the next step into "computer control" (in the Win 95 era). Whether that was actually a good move, is best left as a matter of opinion.
But (for balance, and as you will have seen in the Operation Manual) at least that allows default settings to be held in a computer file (Units.cfg).
Yes; the T-300 has an internal oxygen sensor. Hopefully, it is a common type (galvanic). Perhaps you can add one of these in your next module design!
On that note, my own idea was to poke a laptop hard-drive into one of the RT-200 modules (or add another). Just another pipe-dream, really.
PS: does anyone else remember Mark Colton's PipeDream software? The original PipeDream, that is.
