Hold the lens to be read, also already mounted on the frame, between the contrast background and the machine lens
Bring near or faraway the lens to be checked from the contrast background so that the initials are in focus
Slacken the knob positioned on the back side of the unit, in order to regulate the angle of the machine, and extract the foot according to needs, then tighten the knob for blocking the foot in the desired position; this operation gives the possibility to optimize the reading position
