This model is ideal for teaching and practise. The pupil diameter and refractive error can be set exactly and are therefore reproducible. The front holder accommodates up to two trial lenses; the cyl axis can be read from the graduated scale.

Refractive errors can be set from -7 to +6D with a setting accuracy better than 0.50D. The refraction scale is graduated in steps of 0.50D with an axis scale of 0 to 180 degrees. Pupil diameters 2, 3, 4, 5, 6 and 8 mm.