Hach Pocket Colorimeter II Instruction Manuals page 70

pH,
continued
1.
Collect about 50 mL of
sample in a beaker and fill a
10-mL sample cell to the
10-mL mark with sample.
2.
Press the
POWER
turn the meter on.
The arrow should indicate
pH.
See page 2—4
Note:
information on selecting the
correct range channel.
1—70
3.
key to Using the calibrated
dropper, add 0.5 mL of
Phenol Red Solution to the
cell. Cap and invert to mix.
Note:
for
use a clean and dry dropper.
For greatest accuracy,