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Never guess a bluefin tuna’s weight again. The award winning Bluefin Release Ruler is the must have for serious tuna fishermen. Release Rulers are patented as the only ruler to provide weight and length estimates of fish on the same device, pairing length with color-coded weight brackets that make for instant weight estimation and great pictures. Simply measure the overall tuna length, take a picture and release. The Release Ruler’s contrasting colors estimate the bluefin’s weight and age based on scientific growth charts. The ruler is durable, tear-resistant, easy to stow and charts weights from juvenile to HUGE!


  • HUGE Fish Size
  • Durable
  • Light weight
  • Growth Chart weight estimates
  • 125-inch Measuring Tape