These binocular magnifying loupes easily clip on a pair of glasses (glasses not provided).

roboz放大镜RS-6687 进口放大镜 动物放大镜
The pupillary distance can be adjusted with the central adjustment knob. The double hinge design allows vertical adjustments in front of the glasses so that the optical pieces can be positioned perfectly in front of the eye. Switching between magnified and normal view is possible by flipping up the loupes.

roboz放大镜RS-6687 进口放大镜 动物放大镜

The flip-up hinge tension can be adjusted. The vertical adjustment hinge should be secured after setting up the loupes.  

Specifications:

Magnification                          3.5 X

Working distance*                  420 mm

Depth of field                          55 mm

Field of view                           60 mm

Weight                                   52 gr

*The loupes will provide a sharp image at the Working distance +/- the Depth of field.