Features: This magnifying glass made of excellent workmanship has the characteristics of high magnifying power and excellent touch. His small body can easily slip into his pocket. Parameters:Material: Metal, Glass Lens Magnification: 20 times, 10 times Mirror Diameter: About 18MM/0.71in, 12MM/0.47in Size: About 90*21*13mm/3.54*0.83*0.51in (unfolded), About 52*21*13mm/2.05*0.83*0.51in (folded)Application: Field study, home use, can also be used to identify jade, coins, jewelry, porcelain, bronze, stamps, antiques and so on. Instructions: use your right hand to hold the magnifying glass with the lens parallel to your line of sight (the ideal distance is 10mm), use your left hand to grasp objects facing the light, gradually close to the lens to find the best observation position, so you can see things clearly