caliper
1. An instrument used to measure the diameter of a tree, or other object. 2. The measurement thus attained, usually at breast height.
GardenWeb Glossary of Botanical Terms
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no greater than 5/8-inch (16 mm) caliper. Trees should be protected against peach tree borer before planting and headed back once growth begins, to promote wide-angle branching.
A minimum standard is eight inches of root ball for each inch of trunk caliper for needled evergreens and nine inches of root ball per inch of trunk caliper for deciduous trees. A caliper is measured six inches above ground.
Over the past 10 years, I've put these pruners to the test and have never been disappointed - even when I pushed the caliper limits of hand pruners. The smooth, red handles are comfortable to grip.
Fertilizer use rates should be based on plant type, with younger trees and shrubs generally receiving higher rates (of N) than mature plants. Fertilizer rates for trees are no longer based on trunk size or caliper, but on root system spread, ...
I have demonstrated it for customers (I have removed a 12', 2 "caliper Robinia psuedoacacia in less than 15 seconds), only to give it up to them and watch them decimate the wild growth at the edge of their yards with increasing glee and abandon.
 See also: Plant, Water, Trunk, Leaf, Planting
  
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