Limited Temperature Range for P/B/SC660 and T-series cameras with this specification according to the datasheet is:

±1°C (±1.8°F) or ±1% of reading for limited temperature range

for measuring object within +5°C to +120°C (+ 41 ºF to + 248 ºF)

and ambient temperatures of +10°C to +35°C (+49 ºF to +95 ºF)

This is only valid for the Temperature range one -40 - 120 (-40°F to +248°F)