Another beautiful day in Spudland.
That's excellent empirical data. The only remaining variable is the accuracy of both instruments. If you were so inclined, you could place both probes in boiling water to compare the readings. Using one gauge, right or wrong, allows you to quantify changes, whereas two gauges mess up your data if they don't agree.
I'm not trying to convince you to verify the accuracy of both instruments, it's just a point of trivia.