This stainless steel thermowell will protect any sensor used to detect the temperature of a liquid.
The thermowell can be fitted through the lid of a fermenter by drilling out a hole to house the silicone bung.
The sensor is inserted in the open end of the thermowell. The other end of the thermowell is closed.
The thermowell is placed in the liquid to be tested or temperature controlled, with the sensor positioned inside the thermowell.