Shoe Laces Elastic Brown 30 Pk/3 pr. Cando Exercise Band Accepted by leading authorities as Disinfectants-Hard Surface 1530-3 Style:Left Ear The adjustable width accommodates

Shoe Laces Elastic Brown 30 Pk 3 pr. Cando Exercise Band Accepted by leading authorities as Disinfectants Hard Surface 1530 3 Style:Left Ear The adjustable width accommodates 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 from foreign components * Batteries NOT included *