We just bought a new thicknesser with digital height gauge.
Boy is it difficult to get accurate, I keep on slipping past the zero mark
I found that sligthly tightening the screw when adjusting makes it easier
We zeroed it with a block of known thickness.
It has made me appreciate, however, how inaccurate the old system was, when I tested some of the boards we made with the old machine.
I blame my poor eyesight
Cheers
Wolffie