Are There Any Accurate Fever Thermometers For Home Use?

I tracked my temperature daily for a bit but got wildly different (almost three degrees on many days) readings over a a few minutes using two different electronic under the tongue digital thermometers more days than I got reasonably consistent readings. This was immediately after rising with no eating, drinking, etc. before taking my temperature.

I assumed it was my technique more than the equipment that was primarily to blame but never figured out what I was doing inconsistently.
A common problem with oral thermometers is not placing them in the right spot. They need to go in the little pocket under the tongue to either side. You can't just sit them in your mouth anywhere.
 
I tracked my temperature daily for a bit but got wildly different (almost three degrees on many days) readings over a a few minutes using two different electronic under the tongue digital thermometers more days than I got reasonably consistent readings. This was immediately after rising with no eating, drinking, etc. before taking my temperature.

I assumed it was my technique more than the equipment that was primarily to blame but never figured out what I was doing inconsistently.
Just the opposite here. I've tracked my temp every morning for a couple years now and never had much of a variance at all. Basically, I'm at 98.1 degrees give or take a couple tenths. I use a forehead scanning thermometer (linked in a post above) and it's been solid.
 
The problem seems to be there isn't a clear winner as to which type to get and which model fever thermometer to get. Here's a new story from a few years back that almost makes me think the hand over forehead method my not be that far off .
 
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