Benchmark Measuring Boards are built to last a lifetime of catching, measuring, and safely releasing trophy gamefish of all species. The Measuring boards are ideal for measuring lengths of any fish in freshwater and inshore salwater. Constructed of premium gold-anodized aluminum; completely non-corrosive for heavy-duty use in fresh and saltwater. Ruler Length: 32 Laser Engraved markings every 1/4" for accuracy. Large Numbers for ease of reading.