Shared by Hillary Kleck
http://www.nbp.org/ic/nbp/CALIPER.html
The Tactile Caliper is a simple to use, accurate low-cost measuring ruler for the blind and visually impaired that provides a braille output to 1/16th of an inch.
Developed by SQUIRREL DEVICES (past winner of the Louis Braille Touch of Genius Award), the Caliper allows its user to measure with accuracy and speed. It displays readings directly in braille. It is a simple mechanical instrument that can be used anywhere by people of all ages.
Check out the video below to see the Tactile Caliper in action!