pH Meter, What is it, Price and how to choose it?

November 2, 2021

Before starting with information about the pH Meter, let’s know what the pH is

Most people, even if they do not know for sure what pH is, are aware that it has something to do with acids or bases and that it is very important for our life and our health, because knowing pH is the way in which that for example, we get to know what is the true quality of the water we drink, the water we shower with, the food we eat, in short. Knowing the pH is important , especially for our health. The pH of substances such as urine and blood are also known. But let’s see how experts come to know if a substance is acidic, neutral or alkaline.

In simpler terms, a pH value indicates how acidic or basic the water is, for example. To measure the pH we find a table with colors and numbers. The numbers start at 0, ending at 14, and the colors range from red through green to purple. When we say that a solution is neutral it is because its pH has a value of 7 and the color that represents it is green. On the other hand, when we say that a solution is acidic, its values ​​range from 0 to 6 and the colors that represent it range from the reddest shades to green. Finally, when a solution is alkaline, the values ​​that we find to represent it range from 8 to 14. Starting in shades of green and ending in shades of purple within the table.

What is the pH Meter?

The  pH meter or also called pH meter , is the scientific instrument with which the pH of a substance is measured. For this reason, this instrument has been designed to know the “quality” of substances.

The  pH meter is the only instrument capable of accurately measuring hydrogen ion activity in aqueous solutions. So it is through this fantastic instrument that we get to know what is the alkalinity or acidity index of a substance. This measure is expressed in pH. The functionality of the pH meter is precisely to measure the difference in electrical potential between a pH electrode and a reference electrode.

Points to consider when choosing a pH meter

If you have been thinking about buying a  pH meter or pH meter , I congratulate you, because it is an excellent idea.

What things should you consider when buying your meter?

Calibration
Accuracy
Electrodes
Temperature
Portability
Calibration

All pH metersmust be calibrated to ensure that the results being displayed on the instrument display are accurate. Calibration is accomplished with the use of pH buffers. The most common types of buffer are 4, 7, and 10, and they are often color-coded red, yellow, and blue. You should consider purchasing a meter that uses at least a 2-point calibration and calibrates as close to your expected result as possible (for example, for acidified foods, you will calibrate your meter with pH 4.0 and 7.0 buffers). It is possible to buy 3-point and 5-point calibration pH meters that increase the measurement range, but it is unlikely that you will need it unless you need to test a wide pH range.

Accuracy

The accuracy of the instrument is essential for your measurements. A request for research or quality assurance may require more precision than an educational demonstration. The accuracy of the meters generally ranges from ± 0.1 pH to ± 0.001 pH. For example, a pH meter with an accuracy of ± 0.01 is a good choice for quality control or research environments, however a pH meter with an accuracy of ± 0.10 may be more affordable for your needs. An important point to keep in mind is that very low cost meters often do not last and also more often need replacement after a very short period of time.

Electrode

The electrode is used to measure the concentration of hydrogen ions and is the part of the instrument that is immersed in the solution. Most pH electrodes are glass bulb electrodes. But since glass bulb electrodes cannot be used with food, because there are policies that prohibit it. Non-glass electrodes are available, but they cost more. When considering which pH meter to buy, consider the cost of replacement electrodes, as they are relatively fragile and you will likely need replacement electrodes for the life of your pH meter. It is also worth noting that some electrodes have special tips that do not clog and are very useful if you are measuring the pH of foods that do not mix easily. There is also newer technology available,

Temperature

In case you didn’t know, there is a very important point to keep in mind, pH readings are affected by temperature. To obtain an accurate reading, the pH meter must be calibrated at the same temperature as the samples being analyzed. More advanced pH meters will have automatic temperature compensation to compensate for variations in sample temperature (too hot or too cold). A very good idea is to calibrate the pH meter just before monitoring the pH of a product and analyzing the pH of the samples at room temperature.

Portability

Where are you going to use your pH meter? Are you going to use it in a laboratory or are you going to use it in the field? If you need a portable pH meter, there are them and they are of excellent quality. There are pocket meters. Although they may be small, they are generally durable and waterproof. A personal recommendation is that you look for meters that are designed to float. But you should keep in mind that a portable pH meter, while excellent, is unmatched by benchtop meters. But it is useful for those people who need an instrument that is easy to handle, which is also effective and durable. The portable  pH meter is ideal.

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

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