thats a welded tip thermocouple.
they are very durable. You can run it over with your car and it will still work
we use them all the time in test lab settings
Ok Joe Offset, New Braunfels El Dorado, Weber OTS 22.5 & 18.5, (2) Master Forge Charcoal, Auber ATC, charcoal retort Weber drum rotisserie