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Proportionally spaced (logMAR) lines on one
side and more tightly-spaced numbers on the
other. Line sizes from 20/400 to 20/10 (6/120
to 6/3) equivalent, .05 to 1.25. Card measures
8″ x 10″ (20.3 cm x 25.4 cm).
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 270900