Our Crab Caliper makes the task of measuring the legal size of many different kinds of crab extremely easy. This unique caliper has multiple measuring steps, all on the same tool. Both male and female diagrams are included on the caliper to make a quick and easy identification. This Crab Caliper also includes most crab sizing regulations from Northern California through Alaska. Male and female diagrams Bright color makes it hard to lose Accurate sizing chart so you get it right every time