I would never argue against measuring process temps…
(Recommend that entire thread)
Does that mean you purchased one and are NOT able to measure -78C?
Stating that explicitly is helpful for the rest of the class…especially if you can wander into a local store and get the real skinny on a thermocouple reader that covers the required temp range.
The spec sheets on flir’s website suggest the TM100 is a more appropriate response than the EA11A.
Which reader did you purchase?