MO750 Datasheet, PDF (3/4 Pages) Extech Instruments Corporation. – Soil Moisture Meter

Operation
Preparation for use
1. Align the probe connector keys with the meter connector, insert the probe onto the
meter and secure the probe with the knurled locking ring.
2. Unscrew the battery cap, insert four AAA batteries (observe polarity) and re-secure the
cap.
3. Remove the plastic probe tip cover.
Soil Measurement
1. Press the ‘POWER” button to turn the meter ON.
2. Insert the probe into the soil
3. Read the % moisture in the display.
Data Hold
1. Press the ‘HOLD” button to lock the measured value in the display. “HOLD” will appear
in the display.
2. Press the “HOLD” button to return to normal operation.
Record (Max and MIN)
1. Press the ‘REC” button to begin recording the maximum and minimum measured
values. “REC” will appear in the display.
2. Press the ‘REC” button again, MAX will appear in the display and the maximum value
recorded will appear.
3. Press the ‘REC” button again, MIN will appear in the display and the minimum value
recorded will appear.
4. Press the “REC” button for 2 seconds to exit the record function.
Note: With in “REC – MAX” or “REC – MIN” in the display, pressing the HOLD button will
clear the memory and record function will then continue, but with a continuous update.
Measurement Considerations
1. The probe head should normally be inserted at least 4” (10cm) into the soil..
2. If the soil’s moisture content is very high, it may take several minutes to obtain a stable
reading.
Low Battery
The Low Battery icon
will appear when the batteries need replacing. Replace the
batteries as described in ‘Preparation for Use”.
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MO750 V1.0 2/09