The contrasting color combinations provide easily readable measurements to decrease time for a quick release. Photo friendly graphics for photo and release. The Release Ruler is the ruler to measure not only the length of your Pike & Muskie, but also provide the estimated weight based on scientific data for the average sizes of Pike & Muskie. Stop guessing! Use the Release Ruler today. The ruler is a durable PVC coated vinyl which is built to stand up to the toughest fishing conditions. Satisfaction guaranteed.