The replacement scales for the 1990-7 measuring magnifier are available in two versions:

The standard scale has a 36 mm division that runs from 18 mm on the left to the center (0) and 18 mm to the right. The division is 0.1 mm.

The replacement scale S-1990-7 has a scale that runs from 0 on the left to 36 mm on the right. The scale is 0.1 mm.

As this scale is specially produced in very small quantities, its price is considerably higher than that of the standard scale S-1990-7.