Dual Shellfish Gauge – 140mm Crab & 90mm Lobster 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 140mm and 90mm marine measuring gauge is engineered for rapid size verification. Featuring precision openings for 140mm crab (Brown/Edible Crab MCRS) and 90mm lobster (European/Common Lobster carapace MCRS) legal minimum limits, this tool gives recreational and commercial fishers an instant compliance check right at the water's edge.

Key Marine Engineering Features & Field Benefits

• Dual 140mm & 90mm Precision Openings: Features a 140mm slot for crab width checks and a 90mm slot for European lobster carapace checks—providing two essential compliance checks on a single compact tool.

• 100% Weatherproof Marine 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., 150mm, 160mm, or custom Scallop, Ormer, and Abalone dimensions)? Gauges can be custom-modeled and printed to your exact millimeter specifications.

Technical Specifications & Marine Fitment

• Gauge Slot Dimensions: 140mm Width Slot (Crab) & 90mm Length Slot (Lobster)

• Target Species: Edible Brown Crab (Cancer pagurus) and European Lobster (Homarus gammarus)

• 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 (140mm / 90mm) Crab & Lobster Measuring Gauge

Custom Sizes & Color Requests

• Custom Dimensions: If your local IFCA district, regional council, or fishing club requires different minimum legal slot sizes (or scallop/crawfish additions), 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.