2.5x is the most commonly used model, it can get the largest field of view and the largest depth of field, it is recommended for first-time users to wear
Galilean loupes with big field of view and long depth of focus.
Use high quality optical glasses with coating,clear image and no-distort.
Easy to adjust. Very simple and convenient for user.
Very popular applied to dental,plastic,neurological,ophthalmology,otorhinolaryngology,also can be used for electronic and industry.