Geomax EZ Dig "T" (Touch) model with the additional 4th sensor that compensates for the chassis pitch in the angle of the bucket. Don't pay a guy to hold a grade rod or keep getting in and out of your machine to check grade. The dipper stick includes the "Laser Catcher" window if you want to use a laser to bench instead of having a known point after the machine is moved to re-bench on. The 7" Color Display shows cut, fill, % and the angle of the bucket and it doesn't matter if you are plumb or what angle anything is at....all measurements are to the cutting teeth.