Muller Lyre Illusion With Stand, Scale Manual

Muller Lyre is made as fiber sheet. Its length is about 45 cm. It is fixed
on two Aluminum Rods on the stand. Muller Lyre Illusion is detachable
from the Iron Rods. In front side fixable and adjustable position of
Muller Lyre Illusion. Standard stimulus is 15 cm. In back side scale for
measurement of illusion and two screw for fixing the rod.