1 Pair Optical PH Ruler Pupil Height Meter Optometry PH Test Eye Ophthalmic Tool
100% Brand new and high quality
Plastic PH meter/PH Ruler
Measure pupil height
It is a very good promotional item and perfect for hospital, pharmaceutical or medical supplies
Measurement Range: 0-40mm
Size: Approx. 82x33mm

How to use: (very easy)
1: Remove the lens
2: The bottom end of the Pupil height ruler is clamped into the frame.
3. The bottom of the frame reads the value from bottom to top.

Package included:
Includes:2 x PH Ruler