Proven technology for perfect smoothness

The Big Sonic-Ski® extends the advantages of a single ultrasonic sensor. With up to four sensors, even large area unevenness, such as road waves, are compensated for. Through combining several sensors, the sensing of an extremely long range is made possible. With these measurements, the system calculates an average, and provides a virtual reference level. The Big Sonic-Ski® achieves maximum planarity during asphalt paving, making it unrivalled in its precision. With four sensors, long unevenness that occur in regular intervals of five to seven meters, can be detected. Such unevenness often occurs during resurfacing, and cannot be detected by lesser sensors. The individual sensors can each be positioned separately, increasing the manoeuvrability of the machine, allowing work to be performed on even curvy roads without problem.





Key Features

  • Functions with up to four ultrasonic sensors
  • Temperature compensation in real-time
  • Records the reference over a length of up to 13 meters
  • Flexible scanning at freely selectable measurement points
  • Adaptable to any machine (hydraulics)
  • Stringline or ground sensing mode

Key System Benefits

  • Best-possible planarity
  • Compensates for long stretches of reference unevenness
  • No artificial reference necessary
  • Functions contactlessly
  • Combination of different sensor types possible
  • Largely independent of weather conditions




  • Easy to operate – by means of just four buttons
  • Backlit keypad
  • Clear indication of all connected sensors
  • Swift and simple swapping of sensors
  • Clear, visual icon driven instructions
  • LED status indicators
  • Adaptable to all types of hydraulic systems

Sonic-Ski® Plus

  • Five contact-free sensors scan the reference surface
  • Extremely precise distance measurement by means of averaging
  • Eliminates all minor irregularities from the final result
  • Provides a continuous virtual level reference
  • Temperature compensation in real-time

Big Sonic-Ski®

  • Combination of up to four Sonic-Ski plus sensor
  • Multiple integrated scanning over a extremely long range (up to 13 meters)
  • Contact-free surface scanning
  • Measurably improved surface flatness
  • Simple mounting and operation

Slope Sensor

  • Especially designed for high vibration screeds
  • Ingress protection IP67
  • Slope angle display available simultaneously with level information
  • Simple and easy recalibration
  • CAN-Interface

Rotary Sensor

  • Can be used under all climatic conditions
  • Operates in stringline and ground sensing modes
  • Measuring range: ±30°
  • Ingress protection IP67
  • CAN-Interface

Wire Rope Sensor

  • Very precise height position measurement for milling applications
  • User can replace the steel wire
  • Measuring range: 500 mm
  • Ingress protection IP54
  • CAN-Interface

Dual-Sonic Sensor

  • Inexpensive alternative for contact-free ground sensing
  • Real-time temperature compensation
  • Fixed temperature probe
  • Ingress protection IP67
  • CAN-Interface

MOBA-Sonic Sensor

  • Contact-free ground sensing
  • Real-time temperature compensation
  • Ingress protection IP67
  • CAN-Interface




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