A special measuring tape used to measure and convert a tree's circumference to its diameter.
A measuring device consisting of a thin, flexible, metallic tape which can be wrapped around the circumference of a length of OCTG and is graduated such that average diameter can be directly read from the scale. A diameter tape is also referred to as a pi tape.
Usually a steel or cloth tape graduated with numerals that are 3.1416 inches apart. When placed around a tree at d.b.h., the tree's diameter can be read directly in inches. Same result could be obtained by using a standard measuring tape and dividing the reading by 3.1416.
A steel measuring tape that has a scale calibrated to read a tree's diameter when wrapped around the tree's circumference.