Homebrew #7 Stopper Thermowell by The Weekend BrewerMore Info
From the product description, check product page for current description, price and availability:
- PERFECT TEMPERATURE CONTROL. Use this stopper thermowell to ensure your temperature controller probe is getting the most accurate reading
- SANITARY. Use of this thermowell will ensure your wort stays contamination free
- AIRLOCK HOLE. The stopper has 2 holes, one for the thermowell and one for your airlock
- Fits most glass carboys. Ensure the #7 stopper is the correct size for your carboy before purchasing.
Use with your compatible temp controller and compatible fermenter to take readings of your wort temperature.
Homebrew #7 Stopper Thermowell – note that multiple variations of this product may be available, as such a different version may appear at this link
Also: Inkbird Dual Stage Temp Controller | Yeast Starters & Fermentation