All you need to check your camera balance,
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This review is from: X-Rite ColorChecker Passport (CD-ROM)
A range of calibration cards to aid you in setting the correct colour balance for both your Camera system and the potential changing light conditions around you. Simple to use - though not sure how critical it might be for most peoples needs. We all have situations where "it has to be right" and this might make all the difference for someone's special day.