HY-18 Digital PD Ruler

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

Converts smart phones into professional digital eyepieces for the traditional optical Instruments. Just attach the equipped smart phone to the

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

Feature:  For children, the old and people who are inconvenient to move。  For animals (pet)  Out consultation