RTD with a +/- 0.01 oC from its normal set value (78.37oC)
It depends on your casual requirements and unspecified real requirements for relative and absolute error . You MUST be specific !! In more measurable tolerances.
I suggest you use the 0.1% absolute LMT70A and use a precision Vref and 0.1% resistors to level shift or use a pot to calibrate gain and offset using a CMOS RRIO Op Amp for converting gain and offset to achieve 1mV/‘C
cost &lt;$10 1pc for everything needed.