The gray card on the back is useful. Calibration scripts generate a million errors and are completely useless. The frame of the table top is made of cheap paper and has no rigidity. Absolutely useless. The color page is useful for eyeball comparison if you have a calibrated monitor. It is also useful for checking the accuracy of the scanner. Very cheaply made. The information on the download CD is poorly done and the scripts are missing a required file. Finally found this on the author's page. But nothing written in the script actually works in the real world. But if you just need a gray card,
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