Crab measure for mud and sand crabs
thingiverse
This is a fantastic tool to take along on crabbing expeditions. You can swiftly measure and confirm whether the blue crabs, whether mud or sand, comply with legal limits. The markings found outside denote mud crabs, while those inside signify sand crabs. It has been crafted to adhere to Queensland, Australia's legal dimensions (mud crabs: 15cm; sand crabs: 11.5cm). I've included the Solidworks source file for your convenience, which can be easily modified to fit the specifications in your own region.
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