Hi ahmedelshfie

for your consideration

1. missinganswerfortopjaws.png, check the text for answer for top jaws in missing.

2. always quote your source, i think you got the compadre version? 
http://www.compadre.org/osp/items/detail.cfm?ID=9707 written by Fu-Kwun Hwang
edited by Loo Kang WEE and Wolfgang Christian

by the way,
the Ejs open source Vernier calipers java applet with objects, help & 0-error logic
is my latest vernier caliper, i like the input field a lot, check it out!  ;D