Received a pamphlet from Lyman and was looking at the Mag 25 instructions. First thing I noticed was that the Set Button and Digit Shift key are not used and are likely disabled. That would most likely eliminate the AT feature of the PID.
My units are used on several pieces of gear so I record the PID values and change to the gear being used at the time, but have noticed on the pots even a SV difference of maybe 50° doesn't seem to require that I autotune again.
Also noticed Lyman talks about a 10° swing which is higher than I've ever experienced with my PIDs.
Just something that came to mind reading those instructions. FWIW