HY-18 Digital PD Ruler

Feature:  Retinal Lenses are made of high transmittance glass and precision double aspheric designs that yield an extremely wide

Feature:  Outstanding Optic Quality Ensure the Comfortable View  Precision Machining Makes the Smooth and Flexible Movement  Professional

Feature:  Non-mydriatic image with reliable quality.  45⁰ full-circle design.  Switching anterior-posterior, para-position compensation lens.  Split-line aligning

Feature:  High illumination white LED light source.  Rechargeable green lithium battery.  Fully charged can be used for