I planned to use Geiger counter to stop at 18000 NU/t, but… max is 9999. That’s Co-60, liquid sodium and moderation for quickly burning through Co-60. Also, gibbl-o-meter allows max 9999, while large invar boiler is 20480 gibbl when pressure arrow is pointing up.

I am pretty sure the Max is 65535, as in 0xFFFF. Maybe set it to Hexadecimal with the Screwdriver pointed directly at the display Field.