Specifications:Product Ratio: Standard 10 times, using 4 x AG9 batteries (including batteries)Product Weight: 225gProduct 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 Lenses. Model: Complex Scale/Cross-Scale Principle:To see the details of small objects, move the objects close to the eyes to increase the viewing angle and create a larger image on the retina. But when the object is too close to the eye, it cannot be seen clearly. In other words, to understand the facts, not only should the object have a large enough angle with the eye, but also the right distance should be maintained. Of course, for the eyes, these two requirements are mutually restrictive. If we place a convex lens in front of our eyes, we can solve this problem. A convex lens is the simplest magnifying glass. It is a simple optical device that can help the eyes observe small objects or details. Usage:Observation method 1: position the magnifying glass close to the object to be observed, and keep the distance between the human eye and the object being observed unchanged. Then move the handheld magnifying glass back and forth between the object and the human eye until the image is magnified and clear. Observation method 2: close the magnifying glass to the eye as much as possible. The magnifying glass does not move until the image is large and clear. Goal:1. An achromatic lens without chromatic aberration can observe the image very clearly and identify the gem. It has a box for easy to carry.2. It can also be used for jewelry certification test, substrate surface quality, color correction, etc. Notes:1. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Thank you!2. Please allow 1-3cm measurement deviation due to manual measurement.1 X Magnifying Glass1 X Leather Case1 X Gift Box [Relateproductdetail/]