Hach-Lange DR 2800 eco - Manual (Page 93)

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Advanced Operations
6.3.2 Taking Single Wavelength Measurements
1. Insert the blank cuvette into the cell holder. Press Zero.
Note: The Read key is only active after 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 .