The quintessential instrument for pH measurement is one that is currently in high demand on the market . The name that is usually given is that of a phmeter or potentiometer . This last name comes from the search to measure the hydrogen potential of a water-soluble substance. This is done because it is normally said that the potential of  hydrogen  and all the processes involved is closely connected with pH .


What is a pH meter?

The pH meter is an instrument designed to measure the existing pH in a substance or solution. It is normally used in quality control or in other contexts where the assessment of acidity and alkalinity is a constant. It is an instrument that, using different mechanisms ( electrodes ), seeks to measure whether there is a higher or lower level of acidity or alkalinity.

  • PH meter characteristics
  • History
  • Who invented it
  • What is a pH meter for?
  • Types
  • Parties
  • How does a pH meter work?
  • How to use
  • How to calibrate the pH meter
  • Importance

PH meter characteristics

The measurement of pH has become an increasingly pressing concern not only for the scientist or the specialist , but for each person who needs a quality service or product. Although most people do not know it, the pH of an object is a measurement that is much more present than you imagine. It is, as the reader can surely imagine, the measurement of alkalinity or acidity of a solution . You can possibly measure this on other non-soluble objects , but for the purposes of this article, we will focus on those that are soluble in water.



The origins of the meter can be found in the USA . Born from the hand of an American researcher , whom we will talk about later, this instrument was made under the auspices of the National Technical Laboratories in 1935 . Production and development did not stop there, but continued with the potentiometer design in 1945 . Design whose bases are still a reference today.

Who invented it

The inventor of the meter was Arnold Oville Beckman (1900-2004). This was an entrepreneur, a specialist in chemistry and university professor who patented at the time this instrument together with a company which had much to do .

What is a pH meter for?

In the industrial world, there are an immense number of products that are very sensitive to variations in pH. These can range from medicines, food, and water purifying processes. The measurement of this variable becomes a necessity for the industrial worker who wants to prevent excess acidity or alkalinity that, in some way, deteriorates the quality of the product.


Among the types that we can highlight of phmetro, we have:

  • Analog pH meter.
  • Digital ph meter.


The parts or components that we can mention of the meter are:

  • Electro pH. This is a piece intended to emit and capture the activity of the hydrogen potential within a solution.
  • Some component that compensates for changes in temperature.
  • PH meter. This, in order to estimate the pH level in the soluble substance.

How does a pH meter work?

To estimate the performance of a pH meter , it must be understood that it is based on the performance of a cell. This cell , with electrochemical properties, involves the activity of hydrolytic ions in its chemical reaction . All this in order to define the amount of ions in the substance. The pH of the substance in question can then be obtained .

The resources for measuring the pH of a solution are the instrument’s potentiometer and electrode. The first of these is the instrument that measures the pH of the soluble substance. The second, on the other hand, results from the combination of several cells whose interaction is what allows me to evaluate the electrochemical activity of the substance itself.

How to use

Here are some steps to know how to use the meter:

  • Proceed to turn on the meter.
  • Wait half an hour for the instrument to be available.
  • Remove the electrode from the solution in which it was stored.
  • Clean the electrode with purified water.
  • Insert the electrode into the pH7 reservoir.
  • Press the calibrate button.
  • Rinse the electrode with purified water and dry it thoroughly.
  • Immerse the electrode in the pH4 reservoir.
  • Repeat the calibration procedure.
  • Now, immerse the electrode in the sample, and press the measure button.
  • Wait for the instrument to get the expected reading.

How to calibrate the pH meter

As has been seen, calibrating the electrodes of a pH meter is a very simple procedure that, in fact, is already almost completely automated. The procedure is simply based on immersing the electrode in a solution specially designed for this purpose, and then pressing the calibration button .


It is one of the most widely used instruments in the food and medical industry . PH measurement is a necessity for many companies that, as you can see, seek to offer quality services. For this, a correct measurement of acidity and alkalinity and a substance becomes, therefore, a practical necessity.

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