I have just been given the above dial caliper. It has both a metric and imperial scale but the dial is only imperial. Unfortunately the dial jumps at about the 15mm mark when opening. Its reasonably consistent in the jump but it doesnt always jump when closing the jaws. I guess what I want to know is if its worth attempting to strip and clean it myself or send it to the pros to do at some cost. I very rarely work in imperial measurements so its not something I must have just that it seems an awful waste to junk it.