Verifying the calibration of an X-Rite 391

The 391 calibrates itself each time power is applied to the unit. Owners may also force a calibration at any time during use. The densitometer is completely automatic in this action. In fact NO calibration media is shipped with the unit. There is however, a calibration certification strip available from X-Rite. This strip (P/N 381-25) is certified at X-Rite and individually marked with reference densities. To use a 381-25 for instrument verification proceed as follows:

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