The external indications of decay and problems
inside trunks and limbs, show in the shape
changes the tree adopts to manage stress and
continue growth. When significant external signs of
internal problems are present the Resistograph is
used to assess the extent of internal decay. The
information provided helps to provide an overall
picture of the hazard potential of the tree. The bulge
in the Bigleaf Maple shown at left is indicative of
internal decay. A climbing inspection was made
and the area was tested with the Resistograph.
The durability and
compact construction of
the Resistograph M300
make this instrument ideal
in climbing inspections.
The instrument is equally
at home assessing decay
or defect in the trunk or
root crown.

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