Hach-Lange DR 6000 User Manual - Manual (Page 119)

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Expanded programs
5. Press Verification.
6. Remove all cells from the cell compartment and tap on Start.
7. Inset sample cell 1 ( Figure 3, Page 19 ) in cell compartment
(1) a press Next.
8. Follow the dialog indicated.
9. After the fifth test cell, the photometrical accuracy is
displayed in a log.