Sometimes a visual inspection is insufficient to determine a tree’s structural stability, in which case minimally invasive or non-invasive instruments such as the Rinntech Resistograph® or Rinntech Arbotom® can be used to enable our certified arborists to better understand a tree’s internal conditions.

Rinntech Resistograph

The Resistograph is a drill resistance measuring device that drills a 1.5mm-wide and 45cm-long needle into a tree, which it then uses to generate data down to a resolution of 1/100th of a millimetre. The resulting graph indicates the degrees of resistance in a tree based upon wood density. The device must always be operated – and its data interpreted – by a certified arborist.

Rinntech Arbotom

The Arbotom is a novel impulse tomography unit that uses sound waves to analyse a tree’s interior. Problems such as hidden decay, invisible cavities and cracks and their severity can be easily detected with this device. The Arbotom allows for precise localisation of defects within a tree, allowing our arborists to make informed judgments regarding a course of action.