Hach POCKET COLORIMETER II Instruction Manual page 37

4.
Press:
ZERO/SCROLL
The display will show
"- - - -" followed by "0.0".
Remove the blank.
Chlorine, Free and Total, HR,
5.
Fill another 1-cm/10-mL
sample cell to the 5-mL line
with sample. Cap.
Do not use the same
Note:
sample cells for free and total
chlorine without thoroughly
rinsing the cells between the
free and total tests.
1—37
continued
6.
Use the SwifTest™
Dispenser to add two
dispensations of DPD Free
Chlorine reagent or DPD
Total Chlorine reagent to
the sample cell
(the prepared sample).
Cap the cell and shake
gently for 20 seconds.
Gentle shaking
Note:
dissipates bubbles.