Falling weight deflectometer Englo Instector-4 with GPS modul

Using GPS-module adds the coordinates of the measuring points into the protocol and later you may see them in Google map

Device for measuring ground bearing capacity

Portable falling weight deflectometer (FWD) INSPECTOR-4 is a portable non-destructive device to estimate the bearing capacity of the ground either with or without the binding material. The ground elastic modulus is measured in units of MPa. The device may be used in pavement testing for road construction, building etc.

INSPECTOR-4 uses the falling weight energy for ground elastic deformation. Based on measurement of this deformation, dynamic elastic modulus and several additional parameters can be calculated.
The measurement data is easily presented

The measurement results and other data appear on the backlighted LCD. The results of up to 200 measured series are saved in the device inner memory (each serie contains 8 tests). The saved data can be transferred to PC by BLUETOOTH connection or USB port. Convenient PC software enables automatically produce measurement protocols with measurement date, time and ambient air temperature.

INSPECTOR-4 has rugged and waterproof aluminium body. For transport the device is placed into a reinforced waterproof wooden trunk.


Falling weight: 10 kg
• Falling weight drop height: 800 mm
• Maximum dynamic load: 23 kN
• Loading plate diameters: 140 and 200 mm
• Bearing stress:
With 140 mm diameter loading plate: 1.5 MPa
With 200 mm diameter loading plate: 0.73 MPa
• Deformation measurement range: 0.16 – 30 mm
• Elastic modulus measurement range: 5 – 900 MPa
• Supply voltage: 3 V (two 1,5 V AA batteries)
• Display: backlit LCD display
• Number of measurements with one set of batteries (ALKALINE): > 1000
• Operating temperature: -10 °C to +40 °C
• Degree of protection of device electronics: IP65 (rainproof)
• Weight of device excluding transport case: 16 kg
• Weight with transport case and accessories included: 28 kg
• Dimensions of device: 1150 x 110 x 110 mm

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