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Trees along roadsides need to be tested regularly. The Resistograph is an assisting instrument in terms of testing decayed and hollow areas in trees.
The Resistograph System measures drilling resistance as a smalldiameter needle penetrates the wood at constant speed. Resistograph Systems can drill up to a depth of one meter. However, injury to the wood is minimal as the hole left by the 1.5mm-3mm diameter needle is very small. The sawdust remains in the bore hole which closes the canal.
The resistance measurement is based on the energy used to forward the needle through the wood, and so depends upon the density of the wood. Resistance varies with tree species, but is reduced as wood decays. Resistance is recorded instantly on a waterproof wax paper strip at a scale of 1:1, or stored in an attached electronic unit that can be downloaded into a computer.
The Resistograph Systems consists of several models which that are categorized into four different series (F-, E-, M-, and B-Series). Each model is unique in its use and can be operated in all industries. Some of the models do come with an electronic unit (E-and B-Series) and others (F-Series) can be optionally upgraded. Once the measuring results are stored in the electronic unit the information can be downloaded into a computer for further assessment.
| Tree Care Inspection Video |
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Resistograph...There is No Substitute! 
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