Yep,to tag onto Smokin',I'll test four probes against my thermapen,which I check in ice/boiling water.
I mark my deviations, on each ,on a piece of tape.
By the time I get to the cookoff and beat them around,at least one,or two,will be off a few degrees.
But,like Smokin' says,the buzzer goes of on the therm to remind me to do probe tests ,and see how far away we are.