Discide Ultra Disinfecting Towelettes 6 X 6.75 Pk 160 Oxygen Tanks Accepted by leading authorities as Color:Red Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness and red green blindness each in two forms complete and incomplete * Includes four special plates for tests to determine the kind and degree of defect in color vision * Makes use of the peculiarity that in red green blindness blue and yellow appear remarkably bright compared with red and green * Color plates encased in specially designed album type books for ease of handling * Detailed instructions included 1¯C) * Compact design measures just 4 * TB MRSA HIV H1N1 HBV HBC VRE RSV H3N2 influenza A adenovirus HSV 2 coronavirus Pseudomonas aeruginosa salmonella staph E 75 towelettes