Guardian Forearm Crutches Tall Adult (Pair) Jobst Anti Embolism Stockings Accepted by leading authorities as Nasal Cannulas 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 300 lb weight capacity * Heavy wall high strength aluminum tubing Patient Height Range : 5'10 6'6 Weight Capacity: 300 lb