NEW, HIGHER GRADE, HIGHER CONTRAST SCREENS! After months of work we have finally developed high grade, high resolution screen that divers require! Smaller size with protective hinged, rotating cover. Stows easily in BCD pocket. Write on the patented magnetic screen, erase, write again. The magnetic screen is easily erased with the push of the thumb. A removable double-sided conventional slate on the back allows for permanent record of important information.