difficulties

Comes with nylon zippered carrying case

(Frosted Blue) For use with flat and cone cups 4-10 oz

Power Requirements: 3 AAA Batteries (included)

Fully qualifies for the EPA's rigorous Emerging Viral Pathogen Claim

10 ft: Texas Prevent Blindness - NC (7 Line) Chart SF25 difficulties(9" x 14") May be wall mounted or used with illuminated cabinets (66003, 66004, 66016, 66090). These new charts are recommended by Prevent Blindness Texas and The Texas Health Department. 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.