15 Step Density Tablet
Calibrated and traceable to NIST
Measurement Range: > 0.2 to > 5.0 D
Accuracy: ± 0.02 D
*Image does not represent current version. New version looks the same but has 7-steps.
7 Step Density Tablet
Measurement Range: >0.3 to >4.0 D
Accuracy: ± 0.05 D