Also known as Level 2 security features, semi-covert features require simple, sometimes commercially available tools to view them, such as ultraviolet (UV) lights, polarising filters, magnifiers and lenses. The examiner needs to know where the features are and how to examine them and they are not normally made known to the general public. They are typically designed for retailers, manufacturers and other members of the supply chain, as well as for officials during routine inspections.