Scallop shaped clam gauge keychain
thingiverse
This clam gauge is sized according to Washington State clamming regulation. It is designed to be used on a keychain or lanyard so that you can carry it around easily while you clam. Mix and match to create different color combos and get kids interested in clamming! The insides snap into the main body pretty tightly, so you might need to use pliers to help squish it down.
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