You'll need several pieces of gear to photographically document injuries. A digital SLR (single lens reflex) camera with a dedicated macro lens and ring flash system is preferrable. If a point-and-shoot is used, it needs an optical zoom lens, good built-in flash, a macro setting and flash control. Several scales can be effective, such as the ABFO (American Board of Forensic Odontology) bike mark scale for small injuries. Use a 90-degree scale for larger areas.