i definitely trust the herpstat probe.

i like to mount the probe up out of the way the snakes,
without excess cord showing, using existing openings for a cleaner look
and where it cant get a false reading i.e. spilled water bowl
the probe reading isnt in the "hot spot"
so i use a thermometer to check temps and adjust the herpstat accordingly

dont know if that makes complete sense to everyone but its worked for me
ive trusted my thermometers never thinking to compare temps

what thermometers are most accurate and how can i check accuracy of the temp readings?

Thanks Kirk