53 made it possible to select either external jaws use [color=green]( example diameter of green object) [/color]or internal jaws [color=blue](example use on external dimensions of blue rectangle) [/color]
54 made the vernier caliper behavior more like a real life one with some boundary detection that works well if lightly pressed like in real life? http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1313.0
55 it is possible by accident to over-compressed the blue object for teachable moments with the students to illustrate inappropriate use of vernier caliper Grin
56 possible to over force blue object into be vernier caliper like in 3D z direction, but it should work nicely if the movement of the mouse on drag is gentle!

enjoy!

slowly adding tail