The multifunctional 9-in-1 detection lens keychain is an essential tool for anyone looking to inspect marked game cards or mahjong tiles. Equipped with white, blue, green, and purple lights detection capabilities, this compact device allows you to easily identify invisible ink markings. Simply shine the appropriate light on the cards or tiles to reveal hidden marks. Features -Color:Assorted Color -Material:Acrylic, artificial leather -Size:19.70X1.80X0.60cm/7.74X0.71X0.24in -Size:13.80X3.30X0.50cm/5.42X1.30X0.20in -Multifunctionality: nineinone detection lens keychain capable of detecting white, blue, green, and purple lights, catering to various needs -High precision: detection lens ensures accuracy and reliability, making it a trusted tool for precise light inspection -Portability: keychain design makes it lightweight and easy to carry, allowing for light detection at any time -Versatile use: suitable for use in optical shops, laboratories, and personal settings, providing a wide range of applications -Durability: built to last and resistant to damage, ensuring longterm use and consistent performance Package list: 1 x lens 1 x pouch