http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=684.msg3445#new
Vernier calipers applet with many options for smallest division


normally there is an mark for the smallest scale, like in this applet
[img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=684.0;attach=650;image[/img]
can you see?