I agree with the others concerning the thickness of Ti....around .100 for smaller frame locks, and in the .125 range for larger model folders. On the calipers/micrometers.... I personally think that the dial type are more accurate, and require less care/maintenance (no electronics or batteries to mess with). BUT...I like the digital variety of caliper/micrometers better for day to day use..provided that they are "GOOD" quality. There reason I say this is that there is no misreading the digital models. I some instances, I have misread the dial caliper or micrometer, and not realized it until I tried to do the final assembly of a folder....only to discover that I had removed too much material somewhere, and had to scrap the whole thing.
If your going to go with digital calipers or micrometers, DO NOT BUY A CHEAP SET! Expect to pay $100+ for a serviceable one, and $200+ for "precision" ones. The calipers that I use "day to day" in the shop is a "fluid proof" Mitutoyo, which runs around $130. This model had three digits past the decimal point. I also own a high end set of Starrett calipers that goes 4 digits past the decimal point....I really baby this set...it's super accurate, and was a tad over $300. I also have two digital micrometers..... one is a Fowler brand, and the other a high precision Starrett....basically the same price ranges and accuracy as the calipers.
Don't waste your time or money buying calipers or micrometers off Ebay, Home Depot, Lowe's, or similar.... all it will get you is grief. Get into the MSC website, McMaster-Carr, or someplace that see higher quality.