LaMotte Tracer pH Meter - Manual (Page 10)

10
9. Always turn the meter off and then on before calibrating to allow suffi cient
time to complete the calibrations during one power cycle. If the meter
auto powers off during calibration the calibrations remain valid, but new
calibrations will turn the circled indicators off.
pH Measurement
1. Place the electrode in the test sample.
2. Record the pH after the reading becomes stable and the display stops
fl ashing.
The main display will indicate the pH in numeric units from 0.00 to
14.00. The bar graph will also display the pH value. The center of the
bar graph is 7.00. As the pH increases, the bar graph will move from the
center to the right. If the pH is less than 7.00, the bar graph will move
from the center to the left.
3. Press the ON/OFF button to turn the meter off. Rinse the electrode with
distilled water. Replace cap
pH Measurement of Soil
1. Place a 1:1 ratio of soil and distilled water in a small beaker. For most
analyses, 20 grams of soil and 20 grams distilled water are suffi cient.
2. Wait 15 minutes. Stir occasionally with a stirring rod.
3. Stir the sample. Immediately place the electrode in the sample.
4. Wait until the display stabilizes. Record the pH.
5. Rinse the electrode in distilled water. Replace cap.
NOTE: The fl at surface electrode will allow for readings directly from the soil
if there is enough moisture present in the soil.
Storing Readings
1. After the reading is made press
the MODE/HOLD button to store
the
current reading The storage
location number will be displayed
followed by the reading being
stored.
2. Press the MODE/HOLD button to return to normal operation.
10.04
T
4 pH
H 4 HOLD
78.6
°F