Resizing the Grid

Using the mouse wheel, I can expand or shrink the window. I want to be able to put a ruler on the screen and match the grid to the ruler. Problem is, each click of the wheel expands or shrinks the window/grid too much. Is there any way to make the window/grid expand and shrink in much smaller increments?

Yes, but zooming is not tied to the grid spacing.
The control you’re looking for is in Rhino 7 > Preferences (Settings) > View
Zoom Scale Factor.
I think the default is 0.90 (10%)
I prefer 0.95 which is 5%

Hello- try Zoom1To1Calibrate and then use Zoom1To1.

-Pascal

That did it John. I had to go to .995 to get my ruler to match the grid.
thanks