1. Calibrate Regularly

Nearly all pH meters require regular calibration. The optimal calibration method and frequency will depend on the device you use, how precise your readings need to be, and how often you use your device. 

How to calibrate a pH meter? The key is to know what the right calibration frequency is. Start by referring to the instructions supplied, or contact us if you’re unsure. 

We recommend calibrating your pH meter to a minimum of two points, shouldering your expected pH range. If you want greater accuracy, add more calibration points.

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2. Ensure the electrode remains hydrated

Your pH electrode must be stored correctly. If not, your meter’s pH measurement accuracy and response times will gradually reduce. 

How to fix a dry pH electrode? Submerge your pH electrode in electrode storage solution for one hour, then calibrate. When finished, proceed to measure with confidence.

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3. Store in the correct solution

pH electrodes should be stored in the correct solution to ensure that they are ready for use. Never keep your pH electrode in deionised water, as it will cause the ions within the electrode to leach out. Your meter will perform poorly, but you could also ruin it! 

What is the correct solution for pH electrodes? Always store your pH electrode in an electrode storage solution. If this is not possible, store in pH4 calibration solution. 

4. Clean your pH electrode frequently

You can't always see it, but a dirty electrode is the most common cause of pH meter inaccuracy. Worse still, calibrating a device with an unclean electrode will produce a standardisation curve based on incorrect readings. This problem will persist until your next calibration – even after your meter is cleaned. 

How to clean a pH electrode? Watch a scientist demonstrate “How To Clean A pH Meter Using Electrode Cleaning Solution”.

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5. Inspect often

What if you clean your pH meter, store it correctly and calibrate it often, but your measurements seem slow or inaccurate? Because most pH electrodes are made from glass or have glass components, they’re susceptible to accidental damage. Check for any cracks or breaks before each use. 

IC TIP: pH electrodes are consumables and, depending on use, should last between 6-24 months. When choosing a pH meter, look for pH meters with replaceable electrodes. Replacement electrodes are a fraction of a new meter’s price! 

6. Handle properly

pH meters and their electrodes are made of sensitive electronic equipment. Be careful when using or cleaning your meter. For example, wiping the meter’s electrode with a cloth or tissue can create static and interfere with your pH readings. 

How to handle your pH electrode properly? Never wipe an electrode with a cloth or tissue unless specified in the manual. Instead, clean your electrode between measurements by rinsing and gently shaking off the excess moisture.  Blot the probe dry with a lint-free cloth to remove excess moisture only as needed.

7. Consider application-specific electrodes

The most common pH electrode is the glass bulb type because it’s versatile and affordable. However, there are numerous tasks needing a specialised electrode design – like the measurement of:

• Solid and semi-solid products like food
• Soil
• Not complete liquids (e.g., fabrics or skin)
• Harsh chemicals; and
• Areas where glass is prohibited or should be kept to a minimum (i.e., food processing).

8. Completely submerge the electrode when measuring

Slow or inconsistent readings could indicate that you are not submerging your electrode adequately. 

How to adequately submerge an electrode for a pH measurement? Generally, immerse part of the sensing glass and the junction. However, check the user guide for the minimum required submersion depth and always set aside enough sample volume before taking a pH measurement.