These are great for measuring fish up to 30". They are great in photos because of the high contrast. The device has dual numbering and measures from 8" to 30" in 1/4" increments. The trough helps keep the fish in place. You can use a black permanent marker to maintain your lines and keep them looking sharp for your tournament photos.
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NOTE - THERE ARE 2 OPTIONS. DARKEN YOUR OWN and PRE-DARKENED.