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Light Weight Deflectometer

Compaction test – using cable or Bluetooth

Light Weight Deflectometer for dynamic plate load test using cable or Bluetooth technology: TERRATEST GERMANY 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 Lightweight 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!

Get here the price of your personal quotation!

Using Light Weight Deflectometer TERRATEST 4000 USB


Voice Navigation


incl. Android app


  • International Standard
    ASTM E2835-11
  • 2 fully equipped models:
    using cable: TERRATEST 4000 USB
    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)

Get here the price of your personal light weight deflectometer!

The TERRATEST 5000 BLU device 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!

TERRATEST 5000 BLU 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 devices 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!

Android App
für Smartphone
Testing Mode
Software (PC)
Direkt vom
2 Jahre

Light Weight Deflectometer – Mode of Operation

The lightweight deflectometer is an ideal measurement device for construction companies to quickly determine the compaction quality of the ground on a building site. It is used in earthworks, civil engineering, road construction, pipe construction, gardening and landscaping as well as in railway construction. Terratest also produces the medium sized weight deflectometer which can be used for higher degrees of compaction. Within just two minutes, even inexperienced users are able to measure, print out and archive the ground compaction quality with this handy measuring device. All TERRATEST® models have voice navigation and a GPS system. Voice navigation guides the user through the measuring process by way of announcements which makes using the device a breeze.

This is how the measuring process works: Put the load plate with the sensor on the ground and connect this to the measuring computer. Next, put the load mechanism with the deflectometer on the load plate. Now, carry out three initial impulse first, followed by three measuring impulses. After each impulse, the settlement as well as the settlement graph will be displayed in mm on the screen of the measuring computer. After the third measurement impulse, the screen of the measuring computer will display the dynamic strain model, the Evd-value in meganewtons per square metre as well as the path/speed ratio (s/v value). The result can then be printed out directly on site with the date, time and GPS data, or transferred to your PC. The TERRATEST 2.0 software will support you in creating a highly professional presentation of your compaction evidence. This consists of an individual report, static evaluation and Google® Maps overview of all of the measurements carried out.