A SS weldless thermowell is a great way to upgrade a fermenter for temp control. Simply punch a hole in your vessel, and seal this thermowell kit, allowing easy leak free temp readings from outside. Please note that you will need to purchase a thermometer or temp controller to use this.
Universal Weldless Design
This is included in Chronical fermenters
Retrofit a brew bucket, speidel fermenter, etc.
304 SS
Install in a 17 mm punched hole.
300 mm total length
6.5 mm Ø opening