Digital BW, The Print

You can use VueScan and your flatbed to measure densities. In the
preview, hold the CTRL key down while you hoover on the preview image
of the stepwedge. The densities are displayed on the status bar at the
bottom of the widow.

Accuracy is so-so, but definitely better than eye inspection. I used
that as an input to the LINEARIZE in the curve definition and it
improved matters a lot.

Now I am going to the next level with an Eye One :)