1800 °F @ +/- .1° F ???
even 300°F @ +/-.1°F ....

Please ... try to be serious !!!

This never will be in the Hobbyist or semipro range ... so you'd better buy REAL thermometers and deal with their ASCII outputted result !!!

do not forget you'll have to spare somewhat before getting them ...

A "homemade" thing will give you @ best 1 or 2 degrees precision ( NOT resolution ...)

Alain ( Thermal Engineer ... )