Hello! Do you need help? Click on the operator and write to us.
C, D, H, K, N, O, R, S, V, Z proportionally spaced lines, sizes range from 20/125 to 20/8 (6/38 to 6/2.4) equivalent - this chart can either be wall mounted or used in the LED illuminated cabinet 50.028.00 - 10 feet (3 meters) testing distance - chart size 9"x14" (23x 36 cm)