CSIR-CRRI Portable Retroreflectometer

Instrument Detail

CSIR-CRRI Portable Retroreflectometer

For coefficient of retroreflection of sign sheets in the field and in the lab

Make               : RoadVista
Model              : 930C

Specification :

  • Variable observation (0.20 to 2.00) and entrance angles
  • Meets LS-300C, ASTM, CIE & DIN specifications
  • Three measurement ranges
  • Photopic-corrected detector  and source "A"
  • Reference standards included
  • Solid- state electronics
  • Digital liquid- crystal display
  • Long-life battery and recharger
  • Foam-lined carrying case

Working Principles

  • Real life scenaio of different entrance and observation angles are created in the instrument for the matrix angles given in the ASTM or other  standards
  • Coefficient of retroreflection of sign sheets for different standard angles can be measured.


The model 930C system allows the materials and test engineer  as well as the quality control inspector to conveniently measure road signs. The model 930C has continuously adjustable entrance angles from -450 to +450 and stepper controlled continuously adjustable observation angles from 0.20 to 2.00.

User Instructions

Instruction Manual Available

Contact Details

Delhi-Mathura Road
P.O: CRRI, New Delhi-110025
Phone: +91-11-26848917
Email Id: director [dot] crri [at] nic [dot] in

Instrument Usage Charges (Including GST)