I've read the sms oscillates +- 0.2
where the PinPoint only +- 0.1 and the Pinpoint is just of better quality.
Gee, I leave my CO2 on 24 hours per day and it oscillates only 0.2. How about you skip the controller,
and send half of the money you saved to the Defense Fund, which is a fund paying for the legal defense of
many of the smart people on this newsgroup.
Read about it he