I have a bunch of thermometers.
I'll start with a couple of my favorites....
I absolutely love the ThermoWorks Dot—I keep a Dot probe in the oven at all times so I can adjust the oven temperature more precisely.
I usually leave it on all the time....forget to turn it off. The batteries last a LONG time!
And the oven knob temperature markings have wore off anyway!
Although I do have a Classic Super-Fast® Thermapen® (2-3 second readings.)
I much prefer the ThermoWorks Super-Fast® Pocket Thermometer (RT600C) (5-6 second readings.)
I almost never use the Thermapen!
I start taking the temperature of stuff 3 seconds early—makes the pocket thermometer just as fast as the Thermapen!
The pocket thermometer isn't as bulky as the Thermapen and I can place it in a beaker or the like without it being top-heavy like the Thermapen.
ETA: The Dot has a magnet on the back. I stick it to the range hood.