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 inch marking from the ruler

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

3. Read the fraction from the Mechanical Braille Display


"How do you use a ruler if you're blind? This tactile caliper comes with an ingenious manual refreshable braille display built in - and it doesn't require batteries or a plug!"

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"I am impressed by the potential impact the Tactile Caliper possess for improving my students' ability to participate in STEM (Science, Technology, Engineering and Math) activities"

Janet Ulwick-Sacca
Teacher of Students with Visual Impairments