20 ft: COH (9 Line) Chart SF25 This carrying case (only) for

This carrying case (only) for use with the Maico easyTymp Handheld Sceening Tympanometer allows for durable

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20 ft: COH (9 Line) Chart SF25 This carrying case (only) for(9" x 14") Sloan optotype chart for vision testing at 20 feet. Features two smaller groups 20 25 to 20 12. 5 for repetitive eye testing. 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.