3in1 Photo Reference Tool Gray Card Target White Balance Exposure Temperature Color Calibration Chart Perfect for Photography & Video Test to Calibrate Canon Nikon Sony Olympus FujiFilm Camera Photo 49 color reference tiles - take complete control over their color workflow Revolutionary Dual Axis Color Control - Gray Card 12 step exposure gradient provides perfect tonal reproduction 12 tiles of primary, processed and standard skin tone colors 24 step gradient, unlike any other color reference tool, allows unrivaled True Color temperature control