The Möller-Wedel Optical SIAM is a measuring device for determining the angle between the primary and secondary image on windscreens in accordance with ECE regulation ECE R43. The device consists of an eye-safe laser beam source (laser safety class 2), a telescope and the evaluation software. Due to the optical arrangement the measurement is independent of the distance between light source, windshield and telescope. The included software allows the automatic determination of the angle as well as the recording of the angle together with the measuring position on the windshield in a protocol.


  • No disturbance by local refractive index and power variations due to small diameter of the test beam
  • Easy and fast set-up of the instrument
  • Laser is eyesafe
  • Measurement value is independent of the distance between laser, windshield and telescope
  • Objective measurement results due to PC-based image evaluation software

Software Features

  • Real-time evaluation with 25 Hz frame rate
  • Automatic brightness control
  • Evaluation according to ECE R43
  • Display of the double image angle with magnitude and direction
  • Use of predefined customizable measurement templates
  • Generation of protocol (PDF or ODT)
  • Export of measurement results to spreadsheet software (CSV-format)
  • Transmission of the measurement results via network interface