Materials Testing
    Retroreflectometer ZRM 6006

Retroreflectometer ZRM 6006

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The Zehntner-retroreflectometer ZRM 6006 measures the night visibility (RL) of road markings as seen by a vehicle driver driving with dipped headlight. The illumination simulates the dipped headlights of a vehicle. The day visibility (Qd) of road markings under typical or average daylight or under street lighting is measured with diffused illumination. This makes an objective determination.


  • Budget priced basic instrument for the determination of night visibility (RL) and day visibility (Qd) of road markings as well as ambient temperature (°C/°F) and relative humidity (rH %) combined in one compact instrument.
  • For all types of road markings.
  • For profiles up to 5 mm (0.2“),just put on and measure; additionally, significantly higher profiles can be measured with instruction.
  • In accordance with EN 1436 (for RL and Qd),ASTM E 1710 (for RL),ASTM E 2302 (for Qd) ASTM E 2177 (for RL wet).
  • Factory calibration with a calibration standard traceable to the independent accreditation body METAS, Switzerland.


  • For road authorities, road laboratories, manufacturers of road marking materials, contractors and expert witnesses
  • Determination of night (RL) and day visibility (Qd) of road markings, ambient temperature as well as relative humidity in dry or wet condition, at any given time of day or night, on the road or in the laboratory
  • For all types of road markings paints, marking tapes, thermoplastic and cold plastic materials - whether smooth, textured, profiled, coloured, with or without aggregates / reflective beads
  • Getting the best value - control of road markings after application and during the warranty period
  • Checking for road marking maintenance
  • For jurisdictionally relevant measurements in case of litigation


Standard delivery
  • 1 retroreflectometer
  • 1 calibration standard
  • 1 universal battery charger (100V to 240V, 50Hz to 60Hz)
  • 1 certificate of manufacturer
  • 1 certificate of calibration
  • 1 carrying case with wheels


equivalent observation distance30 m
observation angleEN 1436: 2.29°, ASTM E 1710: 1.05°
illumination angle RLEN 1436: 1.24°, ASTM E 1710: 88.76°
illumination angle Qddiffuse
measuring sensor adaptionV(l)
measuring area (WxL)52 mm x 218 mm (2.05“ x 8.6“)
measuring range (RL)0 - 4’000 mcd•m-2•lx-1
measuring range (Qd)0 - 400 mcd•m-2•lx-1
measuring range profiled markings5 mm (0.2“) up to 12 mm (0.5“) with instruction
measuring period RL/Qd≈2 s
memory capacitynone
displaytransflective luminous graphical display
accumulatorLi-Ion-Mn 14.8 V / 6.3 Ah
operating temperature-10°C - +50°C (14°F - 122°F),
non condensing
storage temperature-20°C - +60°C (-4°F - 140°F)
material housinganodised aluminium
dimensions (LxWxH)560 mm x 190 mm x 280 mm (22“ x 7.5“ x 11“)
weight6.4 kg (14.1 Ibs)
standardsEN 1436 (RL/Qd),ASTM E 1710 (RL),ASTM E 2302 (Qd),
ASTM E 2177 (RL wet)