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Light Weight Deflectometer

Compaction test – using cable or Bluetooth

Light Weight Deflectometer for dynamic load plate test using cable or Bluetooth technology: TERRATEST is manufacturing two models of the Light Weight Deflectometer (LWD), also known as Light Drop Weight Tester (LDWT), Portable Falling Weight Deflectometer (PFWD) TERRATEST devices are always fully equipped with GPS system, printer, high-performance rechargeable battery, USB drive, text input function and PC-software. Our Light Weight Deflectometers combine the best of both worlds: absolutely high-quality equipment made in Germany and an unbeatable price, because you order directly at the manufacturer.

TERRATEST is world leader in the development and manufacturing of Light Weight Deflectometers, which is why we offer the worlds first ” TERRATEST 5000 BLU “ with Bluetooth and voice navigation!

Using Light Weight Deflectometer TERRATEST 4000 USB


incl. Android app


  • International Standard ASTM E2835-11
  • 2 fully equipped models:
    using cable: TERRATEST 4000 USB
    with Bluetooth: TERRATEST 5000 BLU
    Wireless testing via BLUETOOTH
    With the Android app you can control
    your Light Weight Deflectometer
    via smartphone or tablet
  • All models with full equipment:

Weatherproof box with external control button, protects controller electronics

Bluetooth connection between hammer and controller

GPS system with screen display

Integrated printer for immediate printout

High-performance rechargeable battery

New, powerful PC software for evaluation, management and analysis of data

USB drive for data transfer to PC

    in-house development; in-house production; competent, own direct distribution
  • Own calibration system, accredited by the German Federal Road Research Institute (BASt)
Light Weight Deflectometer TERRATEST 5000 BLU

The Light Weight Deflectometer TERRATEST 5000 BLU for the dynamic load plate test was presented for the first time at BAUMA 2013. Tests with the new Light Weight Deflectometer will be carried out without cable, the results will be transferred via Bluetooth directly to the measurement electronics, a smartphone or tablet. No wire gets in the way!

The Light Weight Deflectometer TERRATEST 5000 BLU for the dynamic load plate test impresses with reliable data transfer, quick pairing and extremely powerful rechargeable battery feed.

TERRATEST 5000 BLU  is particularly suitable for the use abroad. Repairs of the socket of the load plate, the “Achilles’ heel” of Light Weight Deflectometers, will no longer be necessary thanks to its wireless operation.

The socket of the load plate has always been the Achilles’ heel of traditional Light Weight Deflectometers with cable connection. Throughout the entire lifetime of the device, the measuring cable has to be plugged into the load plate on the ground, every time a test is being conducted. In the process shear forces arise, which in the long run strain the sockets extremely. In general, the site conditions in utility trench and road construction are an adverse environment for any kind of cable connection.

That’s why experts are choosing TERRATEST 5000 BLU for dynamic load plate tests!