Perhaps it would be best to look at a real vernier calipers first. The one in this animation is rather unusual, but the principle for making a reading is the same.
This applet shows how one interprets the vernier scale on a calipers.
NOTE on most screens the picture will be quite magnified! So it looks about 3 to 4 times bigger than real millimeters.
Put a check in the
Take away the check in the
as decimal sign!
When you press [Enter] you are told how well you did.
There is a QBASIC training program that shows more step by step how each reading is done. It also shows more types of scale division. It is easily downloaded (only 0,2 Mb) here: (zipped or self-extracting). Even QBasic is included so it is ready to run. (The text in these may be in Swedish. I have English versions that I can find or recreate and make available if you contact me.)
1 Pictures of a real
calipers being used | 2 Simulation
showing how to use a (vernier or digital) caliper