I'm asking this because I recently made the switch to all grain brewing, and I'd like to make sure I'm as accurate as possible for mash temps.
I have a plain dial thermometer that I used for some extract brews (bought for ~$10 at my LHBS), but I'm not sure that I trust it. When I bought it, I calibrated it to 32F an ice water bath (lots of ice, just enough water to cover). Just for fun, I tried it in boiling water and it said that the water was only at 206 F after being immersed for 30 seconds in the boil (I am <1000 ft above sea level, so it should still be at 212 F), but still says I'm at 32 in an ice water bath.
Should I try to find a nicer thermometer or just re-calibrate the one I have to the boiling water? If I should upgrade, do you have any recommendations?
Edit: I should also add that I don't really have the funds to spend on a Thermapen.