The Monaco Optix is a single unit designed for precision calibration of LCD and CRT displays for both Mac and Windows operating systems. Made in the United States by the reputable brand Monaco, this product ensures accurate color calibration for a superior viewing experience on various display types. Ideal for professionals in graphic design, photography, and video editing, the Monaco Optix provides reliable and precise calibration for achieving consistent and accurate color accuracy. System is complete as purchased, excluding the counterweight which doesn't directly effect operation.