The resistograph is an instrument that detects decay and cavities in trees and timber. Through resistograph technology, an arborist is able to detect wood decay, stages of rot, hollow areas, cracks and ring structure. The resistograph is an ideal device for estimating tree stability and longevity. The resistograph is based on a drilling resistance measuring method developed by Frank Rinn in Heidelberg, Germany.
As the micro drill enters the tree, the resistance of the wood changes the rotation speed of the drill. These variations are translated into a graph, which looks a lot like an EKG print out. The tiny drilling hole closes itself up without any damage to the tree.
Aside from the tree care industry, the resistograph has a number of uses. It is used to determine amount of decay in living trees, dead stems, roof beams, bridge timbers and wooden framed houses. It is also used in root, trunk and climbing inspections. In some species, the resistograph can be used to measure tree growth diameter and bark thickness. The instrument was initially developed for the tree care industry, but is now used in multiple industries: termite and pest control, utility poles, building inspection, timber bridge inspection and playground inspection. Prevent an accident before it occurs!
The resistograph is fast, accurate and reliable. Its biggest advantage is that it detects decay with virtually no tree damage. It also enables an arborist to analyze annual ring structures and to determine the growth tendency according to the width of annual rings. Its efficiency and reliability make it easy for homeowners to use.
The resistograph will provide you with measurable data which will determine to what extent a tree is at risk of failure. The resistograph is also a key tool for planning a landscape design. It helps homeowners, landscape architects and builders decide which feature tree to keep up when clearing a new home site. It is best to find out if the feature tree has any cavities before you invest in planning the rest of your landscape around it. If you notice any visible defects in your trees, call your local arborist for further examination.
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