R.D.
I have one of those as well, and I've found that 1- I'm right handed, so when I try to slide to the left, the probe isn't flush against the temple so it reads the temp wrong, and 2- when my kiddos aren't feeling well, they're usually snuggled up to something, so if I have to make them sit up to take their temp, the side they were laying on will read the temp slightly higher somethings.
Those things are really anal retentive!