The i1 Pro is a color measurement device (often used for color calibration) made by X-Rite, specifically part of their i1 Series of color management products. It is used primarily by professionals in the fields of photography, printing, design, and digital imaging to accurately measure color and ensure that digital devices (like monitors, printers, or projectors) display colors correctly. The i1 Pro device can be used to calibrate displays, printers, scanners, and more, depending on the setup.