Bluelab Combo Meter - Manual (Page 7)

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6.0 Battery replacement
Batteries are replaced in the Bluelab Combo Meter when the low battery indicator
appears on screen. The low battery indicator remains on and the Bluelab Combo
Meter continues to operate until the batteries die or are replaced.
Open battery compartment by sliding the back cover
down and insert 2 x AAA batteries as shown on the battery
holder. Slide cover back on.
NOTE: Alkaline batteries are recommended.
IMPORTANT: Check the batteries at least once every six
months for signs of deterioration, rusting or swelling.
If signs of deterioration are found, clean battery holder
contacts and replace batteries.
5.0 Measuring hydroponic elements
The values measured in a hydroponic solution by the Bluelab Combo Meter
include nutrient (conductivity), temperature and pH levels.
Taking a conductivity/nutrient reading
Short press the ‘nutrient/units’ button to select conductivity.
Insert the conductivity/temperature probe into solution where there is strong
movement of the solution, or stir the solution with the conductivity/temperature probe.
Wait 1-2 minutes or longer for the conductivity/temperature probe to reach solution
temperature. The conductivity reading will stabilize to a constant value.
If the solution you are measuring is outside the measurement range of the Combo
Meter, an ‘Or’ (over range) will be displayed.
NOTE: The conductivity/temperature probe tip should be cleaned at least once a month
to remove salt build-up ensuring accurate readings. If oily additives are being used the
conductivity/temperature probe tip should be cleaned after each use. See Section 7.0.
Taking a temperature reading
Short press the ‘temp/units’ button to select temperature.
Insert conductivity/temperature probe into the solution.
Wait 1-2 minutes or longer for conductivity/temperature probe to reach solution
temperature. The temperature reading will stabilize to a constant value.
If the solution you are measuring is outside the measurement range of the Combo
Meter, a ‘Ur’ (under range) or ‘Or’ (over range) will be displayed
NOTE: For very cold or very hot temperatures it will take 4-5 minutes for the conductivity/
temperature probe to reach solution temperature. To help decrease time taken to reach the
solution temperature, place the conductivity/temperature probe in an area where there is
strong movement of solution, or stir solution with the conductivity/temperature probe.
Taking a pH reading
Short press the ‘pH/calibrate’ button to select pH.
Remove the storage cap from the pH probe and place the pH probe into the solution.
Wait 1-2 minutes or longer for reading to stabilize to a constant value. The pH
reading is displayed.
If the solution you are measuring is outside the measurement range of the Combo
Meter, a ‘Ur’ (under range) or ‘Or’ (over range) will be displayed.
NOTE: If taking readings of more than one solution, rinse the pH probe tip thoroughly in
fresh water between solutions to avoid cross contamination.
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Battery
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