HCA: Hermit Crab Association

I csnt seem to find any in depth guides to finding the right shell size for my hermit crabs, my jumbo is outgrowing his very fast, what do i measure, how do i measure? All that

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This is the HCA guide to shells:

viewtopic.php?f=24&t=92552

Naples Sea Shell Company has a page that shows how to measure shells:

http://naplesseashellcompany.com/sizematters.html