The AirFly Crab Gauge is a must-have tool for crabbers in California, Washington and Oregon. Designed to measure Dungeness, Rock Crabs , this gauge ensures that you are staying within the legal size limits for these popular crab species. The gauge is made of durable plastic and features clear markings for easy and accurate measurement. With the AirFly Crab Gauge, you can be confident that you are catching crabs that are both legal and sustainable. To use the AirFly Crab Gauge for Dungeness, Rock Crabs, and Concave Black, follow these steps: Place the gauge against the widest part of the crab's shell, just behind the claws. Make sure the crab is centered on the gauge. Check the measurement on the gauge to determine if the crab is of legal size for your area. If the crab is too small, release it back into the water. If it is of legal size, you can keep it for consumption. Note: Always check local regulations to ensure you are following the correct guidelines for crabbing and harvesting. * Designed for measuring Dungeness, Rock Crabs in California, Washington, and Oregon * Quick and accurate way to measure your catch * Features a diagram's gender for easy identification * Made with 1/4 inch thickness of durable ABS material that does not expand or contract in heat or cold