The each marks on the ruler is 0.020" the laser dot looks bigger in the photo
I think would work great for wood work, farm work and steel fab work.
But to use it for machine work NO
Most machine work needs to be at least 0.005" [0.13mm]
I even have a scope for some type work to with in 0.0001" [0.0025mm]
Dave
One photo tell it all
Dave
It does indeed, that's a stationary laser dot not the rotary laser in the link above.
.002" or even slightly better is easily good enough for the stuff I've made to date.