Small foldable magnifier for inspection of plants, insects, etc…  The triplet lens that consists of three cemented lenses produces a better image quality than the doublet lens. The triplet lens image is corrected for three colors, and gives little or no distortion. The higher the magnification, the better this advantage shows.   
 
Magnification
10x
Lens diameter (mm)
21
Lens elements
3
weight (g)
34