Hach-Lange DR 2800 eco - Manual (Page 97)

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Advanced Operations
6.4.2 Carrying out a measurement in the Multi Wavelength mode
1. Insert the blank cuvette into the cell holder. Press Zero.
Note: The Read key does not become active until the zero
measurement has been carried out.
2. Insert the sample cuvette into the cell holder. Press Read.
3. For data storage, see 5.3.1 The Data Log on page 38 .