Perfect Pi Diameter Circumference Tape Measure - Imperial and Metric Tape Measure 1/2-inch by 12ft / 3.5m - Use for Measuring Cylindrical Objects - (Pipe Tape, Tree Tape) Model DCT120 - Amazon.com
Stanley 10ft Tape Measure | Pipe Diameter Tape Measure
Using a DBH Tape to Measure Tree Diameter at Breast Height - YouTube
Lufkin 1/4 in. x 6 ft. Executive Diameter Pocket Tape Measure W606P - The Home Depot
Lufkin 1/4 in. x 6 ft. Executive Diameter Engineer's Tape Measure W606PD - The Home Depot
Measuring tree diameter using a diameter tape - YouTube