The Diameter Tape Measure: A Calculator Without Batteries

Diameter Tape Measure Does The Calculating For You
A Diameter Tape Measure Does The Calculating For You

Why do we call the diameter tape measure a calculator? Because when you wrap it around the circumference of a pipe or a post, it “calculates” the outside diameter instantaneously. It’s a calculator that never slows down because it doesn’t use batteries. The special scale is in inches or millimeters, and it is stretched out by the factor of pi (3.14159). That’s how it does it for you.

Diameter Tape Measure Does The Calculating For You
There’s No Need to Divide By pi