The harbor freight router control is definitely not safe to use as a temperature controller. I just used one to smoke a chicken and it was on for only 5 hours. Breaker blew, and I finished the chicken in the oven. Took the router controller apart and it has melted wires, and has blown the transistor (I think that's what it was). Maybe there are mods a person can do to this, but stock it is definitely not safe.