10 ft: KCRHN (9 Line) Chart Rx Form 11 1/2"H x 4"W x

11 1/2"H x 4"W x 10 3/4"L

The Li-ion battery provides 30 hours of continuous use when charged for 24 hours

With long-lasting LED lamps and DuraShock technology

It's like getting two programs on one USB

10 ft: KCRHN (9 Line) Chart Rx Form 11 1/2"H x 4"W x(9" x 14") Sloan optotype chart for vision testing at 10 feet. Features two smaller groups 10 25 to 20 8 for repetitive eyesight testing (20 50 to 20 16 equivalent). 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.