Aluminum absorption scale composed of 21 steps, thickness 0.3 mm Al.
The scale is used to determine the shape of the sensitometric curve, the speed and the average gradient of the film / screen pair in mammography.

TECHNICAL DATA
- 21 steps
- Dimensions (HxWxL): 6.3mm x 105mm x 10 mm
- Incrementation is 0.3mm Al in steps
- The steps 5, 10, 15 are identified by a drilling
- Size of a step (LxW): 5mm x 10mm