COOKE's cal-COLOR 400 Colormeter provides fast and accurate measurements of color temperature, absolute chromaticity values and illuminance of light sources and display areas. Using four silicon photodiodes sensor-corrected to measure exactly like the human eye sees, every cal-COLOR is individually calibrated to NIST standards. Among its users are Architects, Interior and Lighting Designers, Engineers, Contractors, and Lamp Manufacturers. The cal-COLOR 400 is used in a wide area of applications/locations, including R&D, Light Booths, Theaters and Projection Halls, Warehouses, Commercial Display, Offices. Each unit comes complete with a carrying case, integral stand, battery and calibration certificate. When you need to be sure of your lighting conditions....our cal-COLOR 400 will provide the proof.