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Scallop divers who fail to measure their catch and bring undersized scallops to the surface risk paying large fines and having their boat confiscated. You can avoid this using this Scallop and Cray Measure. Use this to measure scallop and cray while at the bottom. It features an easy grip design so you can hold and measure conveniently underwater. Itâs made of aluminum and you can attach a lanyard so your hands are free.