The Light Weight Deflectometer HMP LFG makes it possible to quickly determine, in an uncomplicated manner, the soil bearing capacity and compaction quality of soils, non-cohesive sub-bases, and pavement improvements. The dynamic plate load tester is described in the Engineering Code for Soil and Rock in Road Construction. The principle of this was developed as early as 1982 in the company preceding the HMP GmbH and has been optimised continuously since that time.

In this way testing inbuilt soil layers can be carried out very quickly and without requiring a vehicle, which means it is also suitable for sites that are difficult to access. The machine is used in many areas – in road construction, railway engineering and earthworks, for quality protection in canal construction and utility trenches, and in the examination of roadbeds and foundation fillings.

Due to the easy handling and the immediately available measurement results, the Light Weight Deflectometer HMP LFG is especially suitable for in-house self-monitoring. The HMP LFG is convincing with its specially thought out construction and ergonomic design. It can be transported and operated easily by only one person. The transportation lock on the drop weight ensures safety.

The load plate is equipped with practical handgrips, and the bubble level helps with the exact alignment of the loading mechanism. Despite this precision, the Light Weight Deflectometer (LWD) is very robust and long-lived: it is made using only the very best of materials. Naturally, the measurement device is splash proof and can be used in all weather conditions.


Technical data

Setzungsmesseinrichtung HMP LFGpro Setzungsmesseinrichtung HMP LFG4

Electronic settlement measuring instrument

Settlement measuring range 0,1 to 2,0 mm ± 0,02 mm
Measuring range Evd < 225 MN/m²
Temperature range 0 to 40 °C
Very robust, splash-water proof, connection cable
with high-quality LEMO connectors
Graphic display in mm 56 x 73 38 x 68
colourful, lightsensor-controlled and illuminated
Fast, efficient 32-bit processor
Bluetooth, USB, thermal printer interface
GPS optional
Dimensions in mm 210 x 100 x 31 211 x 100 x 26
Storage capacity, internal in measurement series 1000 500
Power supply:
high-performance rechargeable lithium-polymer-battery 3,7 V, 6300 mAh
4 x R6 Batteries
Menu navigation (18 languages available)

Loading Mechanism

Total weight 15,0 kg
Drop weight 10,0 kg
Max. impact force 7,07 kN
Duration of impact 17,0 ± 1,5 ms
Material: zinc coated/hard-crome plated steel
Spring element 17 disk springs

Load plate

Diameter 300 mm, Plate thickness 20,0 mm
Total weight 15,0 kg, Material: zinc coated steel


Fast and cost-saving

– Quick examination – only 2 minutes per measuring point
– Measurement result immediately available
– Documentation directly at the site
– No vehicle as counterweight necessary

Easy to use

– Low tare weight, ergonomic design
– Can easily be operated by one person
– Testing even in difficult-to-reach places
– Intuitive menu navigation
– Automatic storage, evaluation and archiving
– Detailed correlations to other test methods exis

Reliable and precise

– Manufactured according to newest technical standards
– Precise, robust, durable
– Calibrated by approved calibration institute
– In use all over the world for more than 30 years


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