Thermowells for temperature instruments (thermometers) are recommended for all process systems where pressure, velocity, viscous, abrasive and/or corrosive materials are present individually or in combination.
A properly selected thermowell will protect the temperature instrument from possible damage resulting from these process variables.
Furthermore, a thermowell permits removal of the temperature instrument for replacements, repair or testing without affecting the process media or the system.
In other words you can remove or repalce a thermometer from your home brewing setup without causing a leak or buring yourself.
Thermowells allow a more consistent and continous measurement of temperatures.
Thermowells completely protect the thermometer from ever having to touch any liquid or solid, which can increase the thermometer life dramatically.
It would only take 1 bad thermometer without a Thermowell to ensure that a whole batch of brew is ruined
Thermometers are notorious for breaking so don't let a cheap item cause a complete destruction of your home brew
These thermowells are perfectly suitable for all cooking ventures, they are 316 Stainless Steel which is the ideal metal for use in cooking, sanitation, brewing or otherwise heating things to be consumed
Other metal types will corrode and ruin your brew with hazardous metals causing a safety concern and forcing you to get a replacement
Brass Thermowell are not suitable for any type of brewing, cooking or sanitation, most brass contains lead