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Resistograph®

The resistance drill for detecting decay in wood

Timber Cruising

Foresters often need to know the amounts of decay present in standing timber. That can be determined by the standard fell, buck, and scale approach. Cut a tree down, dissect it, and then measure the extent of decay and loss of merchantable volume. It is a time consuming process. By using a Resistograph® the sample tree is drilled at the compass coordinates (North to south, east to west, south to north, west to east) and the resultant data recorded and reviewed on site. Because many of the important volume loss decays occur in the butt log of the tree, testing with the Resistograph® is a cost effective way to check for decay.

In some instances, foresters need to know the width of the annual rings or the estimated age of a tree. Is it an old growth tree? If there is a threshold age for that definition, use of the Resistograph® can be a very useful way to investigate the age of the tree. Because the Resistograph® has the capability of sampling at such fine resolutions it is possible to accurately detect and measure the density variations in any one annual ring between early and late wood cells. Annual ring width and wood density data is an important factor for scientists looking at climate data and the Resistograph® provides the data needed for scientifically defensible research.

rinntech resistograph 650

Testing standing timber for decay. Image courtesy of Tolko Forest Industries.

rinntech resistograph

Testing old growth Douglas-fir on Vancouver Island with an R 550 prototype to determine age of tree.

  • 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.