and high quality design provides 100X magnification can be adjustable Illuminated by LED Works on 3 LR927 batteries(included) Bright LED light of the Magnifying Glass provides enough light at any conditions LED has detecting function. This pocket miniscope is ideal for on-the-go science. It's 100X magnification range making it easy to examine blood samples, bugs, and anything else that's worthy of a closer look. The miniscope also includes a built-in LED light that provides a bright, clear , along with a rubberized eyepiece for comfortable viewing. You can take the lightweight miniscope along wherever you go--whether it's a school field trip or a visit to a friend's house. This magnifier with reading function, you can measure the length of the object . Focus is adjustable up to 100X Condition:100% New Length of Lens cylindrical: 12.3cm Optical Lens Diameter: 1.4cm Ocular Lens Diameter: 1.5cm Weight:48g Color: Silver Material:metal Package included: 1 x 100X Jewelry Pocket miniscope Loupe Magnifier 1 x Leather Pouch (batteries included) Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.