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Resistograph®

The resistance drill for detecting decay in wood

Decay in Trees

Many trees have decay patterns caused by mechanical injury, or pathogens moving up into the heartwood from the roots. Tree risk assessors are aware that if the amount of decay is very extensive, there is a possibility that the entire tree might fall down. But simply identifying there is decay present may not be enough. It will depend on the tree species, the type of decay, where it is located, and how much it has spread. This is where judicious use of the Resistograph® can be very helpful.

First of all the assessor examines the whole tree looking for signs and symptoms of decay. These might be obvious cavities, areas of wounded tissue, or areas of response growth such as unusual ribs of wood on limbs or the trunk, or simply the presence of fungal fruiting bodies. Next the assessor considers how these factors might interact and decides where on the tree a reading might be taken to confirm the presence or absence of decay. Using the Resistograph®, data can then be collected and analyzed. In some cases, drilling points will be at the sensor locations used in tomography as a means of confirming the tomogram image.

Because the Rinntech machine is so easy to use, data can be collected efficiently in a cost effective manner, giving the risk assessor important information to use in better determining the likelihood of failure rating for risk assessment.

Resistograph Sample Graph

Resistograph Garry Oak
Resistograph Sample Douglas Fir
Rinntech Resistograph Close-up
  • Resistograph®
    • Timber Testing
    • Decay in Trees
    • Timber Cruising
  • Arbotom®
  • ArboRadix™
  • DynaTim™
  • LignoStation™
  • LignoVision™
  • LinTab™
  • ArboStApp™
  • TSAP-Win™
  • ArboRefT™
  • ArWiLo™
  • ArboMech™
  • TurboCalc™
  • CoreJector™ & Wood Borer

For current pricing and to learn more,  contact
Dr. Julian Dunster North American distributor for Rinntech Inc.
Tel: 778 977 1395 (C) or 778 433-8465 (O)
(Pacific Standard Time Zone)
Email: jd@dunster.ca

This website is owned and operated by Dunster & Associates Environmental Consultants Ltd. as a North American distributor for Rinntech Inc.

Dunster & Associates Environmental Consultants Ltd.

We provide sales and support services for Rinntech products.

Call 778-433-8465 or 778-977-1395
(Pacific Standard Time Zone)
Email jd@dunster.ca (Julian Dunster)

Request more info

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The Word Resistograph

The U.S. Trademark Trial and Appeal Board (TTAB), in late October 2019, dismissed the petition of IML Instrument Mechanic Labor, Inc. for cancellation of the RESISTOGRAPH® trademark in the USA “with prejudice”. This means that the RESISTOGRAPH® trademark continues to be an exclusive trademark belonging to Frank Rinn, the inventor of the term (“RESISTOGRAPH”) for his inventive high resolution resistance drilling devices. Frank Rinn has been developing these high quality machines in Germany since 1986 and his RESISTOGRAPH® trademark is registered in approximately 40 countries. Only machines made by Rinntech are the original Resistograph® devices and entitled to use the Resistograph® trademark. Only data collected with a machine made by Rinntech provide Resistograph® data.