|Overall Size||3.0 in. x 4.04 in. - 76.2mm x 102.7mm|
|Active Image Area||1.57 in. x 3.54 in. - 40mm x 90mm|
|Number of Steps||36|
|Step Size||10mm x 10mm|
|Density Range||0.10 to 1.6|
|with NIST Traceability||Yes|
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.