Wikimedia Commons, image by J. A. Gaspar

Read out to the last line that the β€œ0" is completely past, then add as the image shows - whichever number lines up with a number above. Magic!

On an inch thousandths vernier, it’s usually increments of .025 inches with a scale of 25 thousandths to add, not like the above. Dial calipers and digital calipers get sloppy and prone to zero errors, but a good vernier? Dunk it, drop it, get it dirty, and it laughs. Get you some.