Features memory! Upside down display allows you to take measurements on both sides. 0 - 11.8 inches (5 cm), 11.8 - 17.7 inches (30 - 45 cm), 0.4 - 29.5 inches (1 cm), 18.7 - 29.5 inches (45 - 75 cm), 0.2 inches (5 mm) increments allow the hem to easily hold water from the body of the seat. It reduces burns on the fish when taking a photo, and allows you to measure your mouth so you can do it quickly. Compact storage! Rolls up for portability and mobility.