Light Weight Deflectometer


The Dynatest Light Weight Deflectometer (LWD) is a portable version of the Falling Weight Deflectometer (FWD). The Light Weight Deflectometer uses a load cell and geophones with the same accuracy as the Falling Weight Deflectometer. The LWD can be used to test thin asphaltic pavements, recycled materials bound with foamed bitumen and directly test the unbound subbase and subgrade. The output from the LWD can be used to calculate the strength of multiple pavement layers. The Light Weight Deflectometer meets the ASTM 2583, the IAN73 (UK) standard, the Danish standard, and the Italian standard for determining the modulus and compaction of the material.

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LWD Brochure US
LWD Brochure Metric

Key benefits

  • One person operation
  • Rapid test allows close test point spacing ensuring homogeneity of the test section
  • Modulus output at time of test
  • Assessment of both the compaction and stiffness of material with the same unit
  • Quality control of the subbase layers and subgrade before an overlay is applied
  • Testing of trench restorations to reduce the chance of settlement over time

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Get to know more about the LWD and how it works. Watch the movie.


Dynatest provides clients around the world with high-quality equipment for pavement evaluation.

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