Specifications:

• Product model: 7175
• Product multiplying rate: standard 10X, using 4 AG9 batteries (batteries are included)
• Product weight: 225 g
• Product size: 45*63mm/1.77*2.48"
• Gift box size: 120*90*63mm/4.72*3.54*2.48"
• Product material: metal, 3 optical glass coated lenses.
• Packing: leather case, white box.

Principle: 

• In order to see the details of a small object, it is necessary to move the object close to the eye, so as to increase the angle of view and form a larger image on the retina. 
• But when the object is too close to the eye, it can not see clearly. In other words, to be aware of the truth, not only should the object have a large enough angle to the eye, but also should take the appropriate distance. Obviously, for the eyes, these two requirements are mutually restrictive. If a convex lens is placed in front of the eyes, this problem can be solved. Convex lens is the simplest magnifying glass, which is a simple optical instrument to help the eyes observe small objects or details.
• Usage method:
• Observation method 1: Let the magnifier close to the object to be observed, and keep the distance between the human eye and the object to be observed unchanged. Then move the hand-held magnifier back and forth between the object and the human eye until the image is large and clear.
• Observation method 2: magnifying glass as close as possible to the eyes. The magnifying glass does not move, moving objects until the image is large and clear.

Package

• 1 x Scale Magnifier