The Sonic-Ski PLUS has been in constant development for 20 years and has firmly established itself as a flexible sensor technology in road construction. Thus, the sensor can be changed from ground to rope sensing in just one action and is therefore a real time miracle with changing references. As an ultrasonic sensor that scans the height reference without contact, it is completely wear-free and therefore far superior to other technologies in terms of durability. Disturbing influences such as rain, stones or edges are immediately detected and faded out to guarantee the installation of an absolutely even surface.

  • Wear-free sensor thanks to non-contact sensing
  • Absolute robustness of measured value owing to suppression of interference factors
  • Absolute robustness of measured value owing
  • Flexible, time-efficient adaptation to different references


The digital inclination sensor can be optimally integrated into the CAN network of the system and thus complements the levelling system with a powerful inclination control for paving slopes. The state-of-the-art technology systematically suppresses shocks and accelerations and thus makes your levelling work many times more precise. Thanks to the minimal cable installation, the number of wear parts and the associated potential sources of error are reduced to a minimum.


  • Faster operation thanks to automated tilt control
  • New generation digital sensor that works even faster and more precisely
  • Cable savings thanks to integration into the CAN bus

With up to four variably positionable sensors, the Big Sonic-Ski is a sensor solution in a class of its own. The combination of four sensors is the only technology on the market that detects long-wave unevenness and thus achieves the most precise flatness.

Thanks to quick mounting on the robust aluminium frame, the sensors can be placed individually for each application to measure the height at the right place. Thus, the Big Sonic-Ski is the right solution for every project – whether road, car park, racetrack, airport or roundabout, whether straight road or winding track. Adjustments in the installation are implemented on site in the shortest possible time.

Thanks to non-contact ground sensing of the acoustic ultrasonic sensors, this technology is considered wear-free. The system’s longevity is particularly impressive in harsh environments. Its resistance to heat, vibration, dust and water is an absolute must on the construction site.


  • High precision through constant averaging of measurements from four independent sensors
  • Time-saving owing to user-friendly assembly and flexible handling
  • Increased uniformity by sensing large surfaces


  • Combination of 4 Sonic-Ski Plus sensors
  • Sensing of several, widely spaced points
  • Averaging and derivation of a virtual reference level
  • Even elongated irregularities are levelled out

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