Are digital thermometers just wacky?

[Sarcany]

With a consumer-grade digital oral thermometer, leave it in your mouth tucked tightly against the back of the bottom of your tongue for about 30 seconds before pressing the button to take your temp and then give it 30 seconds to get the result.

If you do this, you should find that they all fall within roughly .2 degrees of one another.

...Unless you get a really sh!tty one.