Looking at a 850j coming up on an auction and I believe they ran a Trimble scb 21 controller on it. How exactly do they systems work? I have never been around a laser blade control system. Most work would be terrace building so I'm not sure if it would be much of an advantage to me. The laser would be nice to see if the ridge of a terrace was to grade but climbing the back of a terrace would pitch the machine and blade back quite a bit so I imagine that would give incorrect readings. Any advice is appreciated thanks
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