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Proportionally spaced (logMAR) lines; line sizes range from 20/200 to 20/8 (6/60 to
6/2.4) equivalent, 0.10 to 2.50. Has holefor hanging on the wall. 18" x 20" (45.7 cm
x 50.8 cm). Folds to 18" x 10" (45.7 cm x 25.4 cm).
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