17005 - Digital PD Ruler
Gulden's Digital PD (pupillary distance) Ruler is a simple and inexpensive way to measure both monocular and binocular distances between eyes.
Gulden's Digital PD Ruler is a simple and inexpensive way to measure both monocular and binocular pupillary distances between eyes. This is necessary for accurate fitting of various ophthalmic lenses, especially multi-focals. It works by simply aligning the vertical stripes over the center of each papillary reflex.
R button measures right eye, the L button measures left eye. Pressing no button measures distance from between the eyes.
Very accurate and responsive digital display Automatic shutoff when place on level surface.