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Calibrating EC meters
 

Calibrating is necessary to ensure the meter’s display produces accurate readings.

Solutions known as ‘conductivity standards’ are made to internationally agreed recipes and are used for this purpose. Refer to your meter's instructions for the calibration procedure. To ensure the calibration procedure is successful, note the following:

Step 1. Ensure that the calibration solution temperature is ambient.

Step 2. To prevent contamination of the stock conductivity standard, decant a portion (sufficient to completely cover the electrodes) into a smaller narrow container for the calibration procedure. Discard this once used.

Step 3. Rinse the electrode in distilled water and gently shake off the excess water prior to placing it in the conductivity standard.

Step 4. Leave the electrode immersed in the conductivity standard for 5-10 minutes, or until a stable reading is obtained, before adjusting the readout as per the instructions.

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Related topics:

"Conductivity (EC) for Hydroponics":

What is Conductivity (EC)? | Units of measure for EC | Using EC to control nutrient concentration

Calibrating EC meters | Maintaining EC electrodes | Buying a conductivity meter