It is a digital precision optical instrument used
to measure distance
between human pupils in the process of optometry for
It employs precise optical structure, the line of light
is very clear and
The measurement results are displayed
the left eye and right eye measuring values are displayed
Simple and rapid measuring operation, and free operation of the
PD adjustment lever are possible.
When the measuring operation is
finished, the auto poweroff and memory
function,enable to save the power and
not to lose the data.
It can also be used in monocular the left eye and right
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.
Electric Voltage：23A 12V battery