Quantitative colour test based on Farnsworth D-15.
The diameter of the stimulus is 3.3 cm and can be reduced by use of restriction rings to of 1.2 cm.
Travel tube comes with black cloth.
This is the laminated version of the Hardy Rand Rittler Test (4th edition). HRR colour test with 20 plates. This book includes 4 demonstration plates, 6 plates for Screening, 14 plates to diagnose color deficiency.
The HRR is available from stock and will be shipped within 24 hours.