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proportionally spaced (logMAR); line sizes range from 20/125 to 20/8 (6/38 to 6/2.4) equivalent, 0.16 to 2.50 - this chart can either be wall mounted or used in an ESV1200 or Model 50.028.00 illuminated cabinet - 10 feet/3 meters testing distance - chart size is 9"x14" (22.9 cm x 35.6 cm)