uWinka Standard 18% Gray Card/Skin Scale for (Double Side, Gray and White) A gray card is a middle gray reference, typically used together with a reflective light meter, as a way to produce consistent image exposure and/or color in film and photography. A gray card is useful for setting or correcting the balance of neutral colors. The gray card is a flat object of a neutral gray color that derives from a flat reflectance spectrum. The typical uWinka gray card which contains two 8x10" cards which have 18% reflectance across the visible spectrum, and a white reverse side which has 90% reflectance. Note that flat spectral reflectance is a stronger condition than simply appearing neutral; this flatness ensures that the card appears neutral under any illuminant. The major use of gray cards is to provide a standard reference object for exposure determination in photography. By placing a gray card in the scene to be photographed, oriented at a defined angle relative to the direction of the incident light, and taking a reading from it with a reflected light meter, the photographer can be assured of consistent exposures across their photographs. Features: Brand:uWinka Type:Standard 8X10" Material:Plastic, paper and foam Small size and easy to carry everywhere. Dimensions:254X220X2mm/10X8.6X0.08" Weight:Approx. 190g/6.7oz (Two cards) 100% Brand New Color:Black and White Suitable for: Film Making Photography Use Flash illumination Package Includes: 2XGray Card (One side is gray,one side is white) 1XOriginal Packing