Stainless Steel Thermometer Dial Thermometer 1/2 Npt Homebrew Kettle Thermometer

As the wort runs through the fitting, it passes directly over this 2" probe, giving you an instant reading of wort temperature. Standard 1/2 NPT Threads(0.8" O.D.) for easy & fast installation on any brew kettle or boiling pot with ports.

eBay