internal hinge design prevents wall damage

34 Specula per Tube) Clear with 4X light output for  versus black ear specula

sneezing and blowing your nose pamphlet

ease of holding and operation

Hand symbol visual acuity charts are great for testing preliterate children

10 ft: SLOAN (13 Line) Chart Discontinued internal hinge design prevents wall(9" x 14") Sloan optotype chart for vision testing at 10 feet. Letter size tests a range from 10 80 to 10 5. May be wall mounted or used with illuminated cabinets (66003, 66004, 66016, 66090). The Sloan optotypes were developed on the same basis as Snellen optotypes. Sloan optotypes do not use serifs however, but do use a logarithmic geometric progression.