How to use a monitor calibrator: advice for digital artists to ensure colour accuracy
Briefly

As with any product, the more money you spend, usually the better product you receive. That is especially true with colorimeters, which must accurately test your monitor's colors.
Try and purchase a device that is robust and well-built. There's no use buying something that will fall apart or have its seals fail after a few months.
Colour software is required to build custom colour profiles and calibration LUTs for a display. It takes measurement data from the colorimeter to create profiles and LUTs.
Before running colour calibration, turn off most light sources in the room. Too much lighting during calibration can skew the readings.
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