As a pocket-sized 18% grey reference square, the Calibrite ColorChecker Gray Balance Mini is a miniature version of that found within the standard 24-patch ColorChecker. This is great for studio photographers and on-location shooting; allowing for a truly balanced mid tone grey value. You can confidently set up corrected studio lighting ratios between main and fill lights, use as the initial reference shot in a series, and can be used to adjust colours within common photo processing software packages.