Measuring system GripTester
according to the Instruction Manual for Skid Resistance Testing with the Longitudinal Friction Coefficient method (GripTester®)

Measuring principle:

• High-speed measuring system (in towing mode; alternatively, pushing mode at walking speed is possible as well)
• Fixed slip of the measuring wheel (15%)
• Measuring wheel vertically strained with 250 N
• Linear, continuous data recording
• Minimum measuring resolution: 16 cm

Quality assurance:

• Time-limited approval through BASt-accredited institution
• External monitoring every four months
• Driver training
• Monthly self-monitoring
• Comparative testing by the Association for quality in skid resistance testing (GGM)
• Camera-controlled data recording

Fields of application:

• Road surface measurements, primarily in the municipal road network and the secondary road network
• Measurements in pedestrian areas, cycle ways, paving and slab surfaces
  (towing mode or pushing mode)
• Measurements of cross-sections (in pushing mode)
• Skid resistance testing of road markings

Measuring Conditons:

• Temperature of the measuring object surface: minimum of 5 °C up to a maximum of 50 °C
• Water temperature (in the water tank): minimum of 8 °C up to a maximum of 25 °C