Braille and tactile rulers have raised lines and markings to help people who are blind or visually impaired to measure length.
Meterstick - Information from the APH Website:
This plastic meterstick has raised lines every centimeter and braille every other centimeter. It is drilled for hanging and has thick raised lines for decimeters.
Not very precise. May be possible to accurately measure .5 centimeters or .25 inch.
Adapted rulers and meter sticks available from APH, some in standard units and some in metric units.
Braille meterstick available for $25.00 (See link)