Light Weight Deflectometer
INSPECTOR-4M is a portable falling weight deflectometer (LWD) for measuring the ground elastic modulus, maximum deformation, compaction factor, elastic deflection and deformation time. It is ideal for testing in regular or difficult to access areas.
Compared to INSPECTOR-4, the INSPECTOR-4M has a built-in GPS module. INSPECTOR-3/4 models use a separate GPS receiver to determine coordinates.
The deflectometer can be used in design, construction, maintenance and quality control of buildings, subdivisions, roads, railways and other environments to measure elastic modulus of unbound or partially bound material, including asphalt, granular aggregation base, base layers, soil, concrete etc.
INSPECTOR-4M is portable, compact and can easily be used by a single operator. The device’s intelligent built-in electronic unit calculates and displays the results immediately after the series of measurements is completed. All measured data is stored and can be downloaded to a computer via USB or Bluetooth connection. The results can also be read to the user’s mobile phone and forwarded via e-mail to off-site staff for real-time verification against expected results.
A built-in GPS unit determines and stores the exact location of the measurement, which can later be graphically displayed in Google Maps.
Features and Benefits
Compact and easy to set up and use
Built-in GPS to obtain and store measurement coordinates
Real-time calculation and display of measurement results
Results stored in device memory
Computer connection with USB or Bluetooth
Data can be sent to user’s mobile phone
Display for alarms and monitoring
Falling weight drop height
Loading plate diameters
140, 200 and 300
5 - 900
3 (2x 1.5V alkaline batteries)
Number of measurements per battery set
-10 to +40
Weight (excluding carrying case)
1150 x 110 x 110