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250 ml bottle to preserve the EC measuring probe.
EC (electrical conductivity) meters can become misadjusted with use and over time, and regular calibration using standard conductivity solutions is essential to maintain measurement accuracy. Calibration allows adjusting the meters so that they provide precise and reliable readings.
Periodic adjustment and calibration of meters with standard conductivity solutions is a common practice in the maintenance of measuring equipment in various fields, such as hydroponics, aquaculture, water analysis, among others. The recommended calibration interval may vary depending on the meter manufacturer, but calibrating every month or two is a reasonable frequency depending on the use of the equipment.
Standard 2.77 EC conductivity solution

A standard conductivity solution of 2.77 EC means that this solution has an electrical conductivity of 2.77 millisiemens per centimeter (mS/cm) at a specific temperature. This solution is used as a reference point to calibrate conductivity meters and ensure that they are providing accurate and reliable measurements.
Preparation: Make sure that both the conductivity probe and the calibration solution are clean and free of any residue or dirt that could affect the measurements.
Calibration: Immerse the conductivity probe in the 2.77 EC standard solution. Adjust the conductivity meter so that it reads exactly 2.77 mS/cm at the specified temperature.
Adjustment: If necessary, some meters allow for fine adjustment using a potentiometer or a calibration adjustment option to ensure a precise measurement that matches the expected value.
Verification: After calibrating, it is good practice to verify the accuracy of the meter using another standard conductivity solution of known value, such as 1.41 mS/cm.
Cleaning and storage: Once the calibration process is complete, make sure to thoroughly rinse the probe with deionized or demineralized water and store it properly according to the manufacturer's instructions.
Remember that the accuracy of conductivity measurements depends both on the quality of the meter and the quality of the calibration solution. It is important to follow the manufacturer's instructions for both the meter and the standard conductivity solution.
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