Dual Shellfish Gauge – 87mm Lobster & 65mm Velvet Crab Measuring Tool

Fast, Accurate Field Compliance Checks for Coastal Waters & Commercial Decks

Checking legal Minimum Conservation Reference Sizes (MCRS) at sea, on moving decks, or along wet coastal rocks requires a fast, reliable tool. Metal gauges easily corrode, scratch equipment, or add unnecessary weight to gear bags, while cheap molded plastics crack underfoot or warp in direct sunlight.

Designed and manufactured in the UK by an engineer with over 30 years of precision CAD and tooling experience, this dual 87mm and 65mm marine measuring gauge is engineered for rapid size verification. Featuring precision openings for 87mm lobster (European/Common Lobster carapace MCRS) and 65mm velvet crab (Necora puber width limit), this tool gives recreational and commercial fishers an instant compliance check right at the water's edge.

Key Marine Engineering Features & Field Benefits

• Dual 87mm & 65mm Precision Openings: Features an 87mm slot for European lobster carapace checks and a 65mm slot for velvet swimming crab width checks—providing two essential compliance checks on a single compact tool.

• Dual Lanyard Mounting Holes: Molded with two heavy-duty attachment points so you can easily secure the gauge to a wrist lanyard, dive harness, belt clip, or catch bag—ensuring it won't drift away in coastal currents.

• 100% Saltwater & Weatherproof PETG: 3D-printed using high-density, marine-grade PETG polymer. It will not absorb saltwater, degrade under direct UV light, or snap when dropped on wet rocks or steel boat decks.

• High-Visibility Contrast Markings: Printed in high-visibility yellow with bold red digits, making size dimensions clear and readable in direct sunlight, low light, or through heavy sea spray.

• Lightweight & Field-Ready: Engineered for minimal bulk in tackle boxes, fishing vests, dive belts, or catch bags while maintaining rigid structural integrity across both measuring slots.

• Fully Custom Sizes & Combinations: Need specific regional slot sizes (e.g., 70mm velvet crab, 90mm lobster, or custom Scallop, Ormer, and Brown Crab dimensions)? Gauges can be custom-modeled and printed to your exact millimeter specifications.

Technical Specifications & Marine Fitment

• Gauge Slot Dimensions: 87mm Length Slot (Lobster Carapace) & 65mm Width Slot (Velvet Crab)

• Lanyard Attachment: 2x Integrated Rigging Holes

• Target Species: European Lobster (Homarus gammarus) and Velvet Swimming Crab (Necora puber)

• Material: Outdoor Marine-Grade PETG Polymer

• Standard Supply Color: High-Vis Yellow Body with Contrast Red Digits

• Manufacturing Origin: Designed & Made in the UK

Package Contents

• 1x Dual-Slot (87mm / 65mm) Lobster & Velvet Crab Measuring Gauge with Dual Lanyard Attachment Points

Custom Sizes & Color Requests

• Custom Dimensions: If your local IFCA district, regional council, or fishing club requires different minimum legal slot sizes (such as a 70mm velvet crab notch or 90mm lobster slot), message us prior to ordering and we will update the CAD model to your exact specs.

• Custom Colors: Standard delivery ships in high-visibility Yellow/Red. Custom colorways (such as High-Vis Orange, Marine Blue, or Black) are available upon request.