The award winning Brook & Rainbow Trout ruler is a must have for serious Brook and Rainbow Trout fishermen. Release Rulers are patented as the only ruler to provide weight and length estimates of fish on the same device. Simply measure the overall Brook or Rainbow Trout length, take a picture and release. The ruler is made from a durable PVC which is tear-resistant and easy to stow. You will simply not find a higher quality trout ruler for the price on the market today.