Per dpb:
The problem with inexpensive bulb thermometers is that the capillary
dimension has to be exceedingly precise in order to control both the
linearity and scaling and doing that drives the price up

What type would you say is the least prone to inaccuracy?

Bi-metallic spring?

Digital?

I have played around with digital sensors and a Raspberry PI and the accuracy
was pretty bad.... but maybe that's just el-cheapo sensors and/or my
programming approach...
--
Pete Cresswell