LaMotte DHA 3000 Digital pH Meter - Manual (Page 7)

MEASURING pH
NOTE: If necessary standardize the DHA-3000. See Standardizing (p. 6)
for instructions.
1.
Press button labeled “°C”.
NOTE: If “BAT” appears in the lower left corner, the battery is low
and should be replaced. See Battery Replacement (p. 9) for
instructions.
2. Remove pH electrode from soaker bottle. Rinse pH electrode and
temperature probes with deionized or tap water.
3. Place pH electrode and temperature probe in unknown sample. Wait
until display stabilizes.
NOTE: The tip of the pH electrode must be immersed in the sample.
4. Press button labeled “pH”. Record reading as pH.
5. Press button labeled “OFF” when finished testing.
6. Remove electrode and probe. Rinse with deionized or tap water. Place
pH electrode in soaker bottle for storage.
MEASURING THE pH OF SOIL
1. Place a 1 to 1 ratio of soil and distilled water in a small beaker.
NOTE: For most analyses 20 grams of soil and 20 mL of distilled
water is sufficient.
2. Wait 15 minutes, stirring occasionally with a stirring rod.
3. Stir sample. Immediately place pH electrode and temperature probe
in sample.
4. Press button labeled “°C” on DHA-3000. Wait until display stabilizes.
NOTE: If “BAT” appears in the lower left corner, the battery is low
and should be replaced. See Battery Replacement (p. 9) for
instructions.
5. Press button labeled “pH”. Record result as pH.
6. Press button labeled “OFF” when finished testing.
7. Remove electrode and probe. Rinse with deionized or tap water. Place
pH electrode in soaker bottle for storage.
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