31 Step Reflective Gray Chart (ST-50)

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Material:   Reflective Material
Overall Size:    3.0 in. x 4.04 in. 
     (76.2mm x 102.7mm)
Image Area:   1.57 in. x 3.54 in.
     (40mm x 90mm)
Steps:   36
Step Size:   10mm x 10mm
Density Range:   0.10 to 1.6

The ST-50 gray scale chart is a reflection object on semi-matte photographic paper. It is available either calibrated or uncalibrated. The four corner patches for the calibrated scales are within 0.02 density of each other. Each area is 10mm square.