LY-9F PD&PH Meter

LY-9F PD&PH Meter

Product Description

Product Abstract:
● Pupil distance and pupil height combined product.Easy to be operated.
● When measuring PD,adjust the top knobs in the left and right.
● When measuring PH,please wear glasses,adjust the middle knobs in the left and right,from boresight of eyes which get through lenses to the lowest bottom of glasses is ok.
● It's also an essential tool for optometry of progressive glasses.