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

Technology to detect and assess

decay in trees and timbers


Resistance drilling

rinntech resistograph transparent background

It is often difficult to know if there is or is not decay inside a tree or timber structure. Careful use of the Resistograph® allows the user to see the wood condition and then make an informed decision based on accurate data.

The word Resistograph® is a trademark belonging exclusively to Rinntech. For more information see


Sonic Tomography

rinntech arbotom

The Arbotom® is a sophisticated sonic tomography machine that uses stress waves to detect wood condition inside live trees. The resulting tomogram is interpreted to model strength loss within the tree cross section to better inform risk assessment decisions.