The Resistograph System is based on a drilling resistance measuring method. A drilling needle penetrates into the wooden structure with a regular advance speed, and the drilling resistance is measured. The data is recorded on a wax paper strip or instantly printed out by a printer.

The advantages of the Resistograph are quite obvious : The wood will only be insignificantly injured, and the drilling hole closes itself due to a special drilling angle that was customized for the drill bit. A special computer program (F-Tools, E-Tools, B-Tools, and T-Tools - see Electronic Unit) is available for all instruments. If the Resistograph is equipped with the Electronic Unit the user might as well downloads all information gathered during the day into the above mentioned computer program. Graph profiles can then be downloaded and analyzed.

Other Advantages of the Resistograph :

• Fast, accurate and reliable.
• Find wood decay, rot, hollow areas and cracks.
• Analyze annual ring structures.
• Determine growth tendency according to the width of annual rings.
• High efficiency due to less work having to be done.
• Unneccessary wood damages are prevented.