Features For Printing: Widely used in the printing process to determine the ink quality and adjust the color, that is, four types of ink (cyan, magenta, yellow and black) reach the same point to form the desired tone. Clear scale: with the scale, it is easy to calculate the number of weft threads in the fabric, that is, the crossed threads of the fabric. Widely Used - For quality control in the paper and printing industry to check the security features hidden in airline tickets and passports, and for observing and using small institutions such as small circuits in electronic applications. 【With Light】Designed with lights, this magnifying glass can also be used in the dark, you can see clearly the elements to observe. Easy Folding The magnifier is foldable, easy to store and carry, convenient to use. Specification: Item Type: Magnifier Material: Metal, Glass Lens Battery: 2 x LR927 button batteries (built-in) Overall size: approx. 3.9x5x5.6cm/1.5x2x2.2in Top width: approx. 3.8cm/1.5in Lens diameter: approx. 2.8 cm/1.1 inches. Application: Magnifying Glass Package list: 1 x magnifying glass. 1 x leather case. 2 x Button Cell Batteries Package List 1 x Magnifying Glass 1 x Leather Cover 2 x Button Battery