Lined Index/Recipe Cards
The lines on them are spaced at 1/4 inch intervals.
I line up the edge of my presser foot on one of the lines and then - if the needle position is movable, I line it up either on the "next" line - or as close to it as possible.
If the needle position is "fixed" - then I lower the needle and see where it "hits" - and then adjust how I line up the fabric with the edge of the presser foot.
Then I sew for a couple of inches on the card to see if I like how my stitching is lining up.