Alat Uji Kayu Resonance Log Grader

Alat uji Kayu pohon, alat uji pohon, alat uji kesehatan pohon, Root Testing Fakopp, Root Detector Fakopp, Distributor Alat Uji Pohon Indonesia



Future lumber characteristics depend on the quality of the log. Stress wave velocity is a good predictor of log quality, as it largely influences the dynamic MOE (calculated as the product of density and stress-wave velocity squared).

The Resonance Log Grader is a simple tool. It consists of a hammer and an Android phone or tablet with a specialised software. The user enters the length, then hits the end of the log. The accurate velocity appears on the screen and a grade is assigned based on the results.


  1. Set the length of the log.
  2. Hit the end of the log with a hammer.
  3. Read the calculated velocity and grade appearing on the screen.


Software only


Log length range 1-12 m
Accuracy of the frequency measurement ±2 Hz (depending on the actual android tool)


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