The Grainfather Thermowell consists of a tube closed at one end which can be fitted to a fermenter and allows for the Grainfather Thermometer, or the GCA temperature probe to be inserted to read the fermentation temperature.
The Thermowell is fixed to the fermenter so that the closed tube is surrounded by the fermenter contents. The thermometer or temperature probe can then be inserted and can read the temperature accurately, without touching the liquid.
A 14mm hole in the fermenter is required for installation. The Thermowell is also a spare part for the SF70.