Photograph of several early prototypes of the Tactile Caliper

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How to Use

A person closing the caliper jaws on the object to be measured

1. Hold the object to be measured between the jaws

A person touching the ruler to find and read the inch Braille markings

2. Read the closest centimeter marking from the ruler

A person touching the sliding jaw to read the fraction part displayed in Braille

3. Read millimeters from the Mechanical Braille Display