Tree caliper

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Science and technology

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What Wikipedia says

A tree caliper is a tool to measure the diameter of a tree. When used in forestry, the tree caliper tool measures the DBH or "diameter at breast height" of a tree that is growing in a landscape of any kind. The measurement is generally made at 4.5' or 1.4m above the soil.

Excerpt from the Wikipedia article “Tree caliper”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Gerhard Elsner, CC BY-SA 3.0, via Wikimedia Commons.