Clam, Crab, Oyster Shellfish guage
thingiverse
Thought there would be something like this here but no, so I made a quick model. top is a 5" guage to measure Blue crab, middle is a 1" opening for clams and the bottom is a 3" guage for oysters. Anything larger is on the dinner table! Happy hunting/fishshing/digging if you are lucky enough to have access to shellfish! Check your local regulations of course....
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