Question

The insturnment used to measure diameter of a tree trunk is called as

Answer 1

the two most common instrument used to measure DBH are the girth (or diametre) tap and clipers.

Answer 2

The two most common instruments used to measure DBH are a girthing (or diameter) tape and calipers. A girthing tape actually measures the girth (circumference) of the tree; the girthing tape is calibrated in divisions of π centimetres (3.14159 cm).