-Verifying DTP41 AccuracyIDEAlliance has created a version of their popular T-Ref cards formatted for the X-Rite DTP41. This provides you with an unbiased, 3rd party, certified reference that you can measure using ToolCrib to verify your instrument is measuring accurately. The reference is available for purchase from their website:
http://www.printtools.org/colorrefcards/tref_xrite.php