If your work is related with fasteners like screws and bolts, then you must have this iOS app for better measurements of bolts and screws or other related materials. People who make their own things must have this app because they may not have much information about the screws or bolts which there are using or wanted to use.Wonderbolt is an iOS app which is useful to measure the length and width of a screw or a bolt. It also provides some of the related information like wrench sizes needed, decimal equivalents, thread profiles and counts, etc of the measured fastener.
This will be the best method to measure and identify fasteners easily. At, present, it is not yet released to public (At the time of writing this post). Please visit their Official site for more information or to download it after its release.
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Amazon: Kreg KMA2900 Multi-Mark Multi-Purpose Marking and Measuring Tool (Kreg) [$14.75]