I am thinking of drilling a very small hole in the lid of my mash tun. The hole would be pretty much exactly the diameter of my dial thermometer so it would take some slight force to slide it in. It would be an extremely nice cheap method for monitoring my mash? Any issues any one can think of other than the obvious heat loss possiblilty and maybe a steam/condensation issue? I don't think either of those potential issues would really amount to much problem.
Jay
