Why I spit on the meat smoker.
When I started my welding apprenticeship I worked almost exclusively in high strength and abrasion resistant steels that usually required pre/post heat treatment. I remember asking about temperature measuring crayons on my first day and the foreman said, “spit on it. If it sizzles, we’ll call that a 250 degree preheat and if it bounces off nicely we’ll call that 450.”
The foreman didn’t know what the term Leidenfrost Effect meant but he sure knew how to use it. The method is more precise than you might think and it served us well. I use it to this day when I’m welding and also when I’m worried that the smoker is getting too hot.