R_O_M
Guest
You could try the Australian built "KEE" ultra sonic depth control system. It uses ultra sonic pulses to measure the height above gound and is wired into the hydraulics of the machine and automatically keeps the same height above ground that you dial in. We use it for constant depth control when seeding. I think they make a unit for header height control such as you want. There is or was a Canadian system available for combines that works on the same principle.