Hi friends in making duplicate keys by handpille we use a lot a caliper tools handmades, or the commercially available one. and i find this time consuming in checking, opening the caliper, checking the original key, and the duplicate i am making. so why not design a something easy to use and less time consuming. here is my idea.
http://i302.photobucket.com/albums/nn11 ... KGauge.jpg
why i use letters instead of numbers? well in numbers at 10 it will congest the space. anyway it just a referrence point of the original and the duplicate. to locksmiths who want to make for their own, here are the drawings.
http://i302.photobucket.com/albums/nn11 ... drwng1.jpg
http://i302.photobucket.com/albums/nn11 ... awing2.jpg
hope i help you in some way. regards.