Reverse seat without meat thermometer?

Go by touch. Thumb to pinky is well done, thumb to index med rare

ETA: truly it’s how fast the meat bounces to its original shape after poking it. The faster it retracts to original form after the poking the more done it is. I would say go for 2.5 seconds but that’s a guess. I haven’t ever timed it

https://www.lobels.com/perfect-steak

This is for searing first, but you can just flip the process.

I had a meat thermometer fail on me in a crucial moment. Googled medium for steak on reverse sear at 275. 20 minutes.

Sear it after that.