Blichmann BrewMometer Bi-Metal Thermometer - 1/2" NPT (3.25" Stem) (Celsius)
Accurately monitoring the temperature of your wort is extremely important when making beer. The airtight seal on the 3" face dial of this Blichmann ensures that you will always get the correct Celcius reading.
Attach this thermometer to your female kettle coupler using the 1/2" male NPT, and know it is leak-free with the included O-Ring. If you are drilling your kettle hole make sure that it is high enough that it is away from the heat source, yet low enough to obtain the average temperature of your wort.