Our low reading mash tun dial thermometer tested accurate within 3 or so degrees of a couple of control thermos.
I am now thinking something in our mash tun setup is causing a poor reading. Maybe our sight glass setup is to blame, or the level at which we are mounting it. Either way, we need a better set-up.
The best performing thermo I have is the Taylor digital. I bought two, and one arrived with a dead battery and the other got wet internally despite its waterproof claim.
I cleaned them out and replaced their batteries. They both seem to work and are within a half a degree of each other at room temp. Best of all, they can be calibrated.
I hope to fashion some type of extra waterproofing for them. Perhaps I will wrap it in saran wrap. I thought of sugru but it is not food safe.
Los Angeles Brewers 