I using a biab system and i was checking the mashing temperature all the time, so i THINK it was ok. Also, my gravity was near the expected in my recipe. Is there another way to know i did something wrong?
I checked my thermometer temp using the water boiling temp and it was ok for my altitude. I will recheck! I also checked the hydrometer with my water and it was pretty close to 1. So i don't think that's a problem
Thank you very much for the info!
The trick with checking a thermometer is that they do not always respond linearly. While it may read ~100*c at boiling (adjusted for altitude as you mention) it may not read 0*c in ice water. And if it reads correctly both at boiling and freezing, there is still no surety that it is correct at 68*c. This is a sticky problem, how do you know? if you have access to a Lab grade thermometer you can check yours against that at a given mash temp (68*).
Another option is the empirical approach, if it finishes too low at what your thermometer says is 68*c try mashing next time at 70*c and if that gets you what you want you will know that on your system you need to mash about 2 degrees higher than you think.