I use a plain old floating thermometer for checking all my temps while brewing. While reading another thread on here today, I decided I needed to check my thermometer for accuracy. So, I boiled some water and held it in there while it boiled. It topped out at 206* at a rolling boil. So I did a little digging, and found out that water boils at lower temps in higher elevations(2*per 1000ft) and I live at about 2300ft. So according to that,my water should boil at around 207*. In theory, my Thermometer reads 1* low.
Does that sound accurate or am I off 6*?
I suppose i shouldn't sweat it since I usually get about 75% efficiency, my highest being 80% so far. That tells me I'm getting decent conversion.