[FS] I have grouphead thermometer which screws into an E61. I bought it from Chris Coffee about a year ago and it still works great. I just put in a flow-profiling upgrade and the spot where the thermometer used to go is now occupied with a pressure gauge.
I am nearly certain that I paid about $110 for it...plus or minus.
I'm asking $40 and you pay for shipping...which shouldn't be much as its small and lightweight.