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This durable chart is made of plastic-coated, galvanized steel with 2 sets of 20 magnetic
strips (40 total) with 5 characters on each strip. Meets all qualifying standards for military
aviators (e.g., officer candidates, pilots, air crewmen, etc). Approved by the Navy Bureau
of Medicine and Surgery (BUMED). Chart measures 9.5″ x 11″ (24.1 cm x 28 cm).
20/20 size . . . . . . . . . . . . . . . . . . . .400500
20/40 size (not shown) . . . . . . . . . . .400900