Anyone encounter this? My electric oven is lined with quarry tiles since I
bake a lot of bread. I use a Taylor thermometer to measure the temp, and
when the tiles are in the oven, the thermometer reads significantly lower
than the oven's digital readout after preheating. At lower temperatures
(300), the difference is about 60 degrees. At higher temperatures (475),
it's about 25 degrees.

When the tiles are removed, the readout and the thermometer are within 3 or
4 degrees. I keep the thermometer close to the oven's temperature sensor, so
they are measuring temperature at the same location in the oven.

All readings are taken after the oven has preheated for at least 45 minutes.

Obviously the heating characteristics of an oven change when there are tiles
involved. But why would they cause the thermometer and the oven's
temperature sensor to behave differently? And most importantly -- which one
is right??

Pete