I have a couple of guru's and they work great. Pretty sure they make them for other cookers. Not sure about pellet cooker though. You could check here:

https://www.bbqguru.com/storenav/chooseguruguide

BUT I have one large (my first one from 18 or so years ago) that will get to and stick at 250 until the coals run dry. I've let her run without doing anything for as long as 20 hours at 250. No guru or nothing. Just the vents.

Proud to be a true Sandlapper!!

Go Nats!!!!