Lightweight and convenient, easy to carry GCD optics, 21mm wide field of view archive view Can be used to identify: porcelain, jade, bronze, calligraphy and painting, jade, antiques, southern , amber, turquoise, dzi, etc. No distortion at the edge of the field of view, consistent with the sharpness of the observation center and edge position This magnification can be connected with the mobile phone through the bracket Reading Newspaper Reading Learning Elderly Home Reading Book Handheld Magnifying Glass Portable