pH meter, turbidimeters and multiparameters

The pH is the unit of measurement that describes the degree of acidity or alkalinity and is measured on a scale ranging from 0 to 14. An approximate indication of pH can be obtained using pH indicators or tapes, which change color depending on the variation of the pH level. But these indicators have limitations in terms of accuracy and can be difficult to interpret correctly in dark or colorful samples.

A pH meter is an instrument used to measure the acidity or alkalinity of a solution. The quantitative information given by the pH value expresses the degree of acidity of an acid or a base in terms of the activity of the hydrogen ions.

How does a pH meter work?

You should keep in mind that the most accurate measurements are obtained using a pHmeter. The measurement system is made up of three parts: a pH measurement electrode, a reference electrode and a high input impedance meter. The pH electrode can be considered as if it were a battery, with a voltage that varies according to the pH of the measured solution. The electrode that measures pH is a glass bulb sensitive to hydrogen ions, with an output in millivolts that varies according to changes in the relative concentration of hydrogen ions inside and outside the bulb. The output of the reference electrode does not change with the activity of the hydrogen ions.


Types of phmeters that a laboratory may need.

Product categories to select



Portable turbidimeter. It is suitable for process control and field use ...

pH Meters

This meter is suitable for measuring the pH of samples and general water, precision: 0.01 pH ...

Conductivity meters

Portable dissolved oxygen meter. This meter is suitable for external applications ...


Ion meter

Portable meter designed to measure ionic density. The number of ions per centimeter..


Oxygen measurement

The meter is suitable for measuring pH, redox, ion concentration, conductivity, TDS, salinity, etc ...


In Kalstein you can find the pH meter or the turbidimeter for  your laboratory.

At Kalstein we have an excellent range of pH meters for your laboratory. That is why we invite you to take a look at the β€œProducts” menu. Here we share you different tips for a better use of pH meters or turbidimetros

Always read the instruction manual before use. We must not forget that although the instructions can be boring, they will generally answer the questions we have about the correct use and care of the pH

Always make sure that the pH meter has been calibrated correctly, always move the pH meter in the water or solution to eliminate air bubbles and do not store it in distilled water.

If the handheld meter includes a storage solution in the lid, store the meter in a vertical position for the most efficient saturation.



Never touch a sensor electrode or reference cell with your fingers: the skin oil affects the readings and may permanently damage the pH sensor. Clean the electrode with the cleaning solutions created for this purpose.

What is dissolved oxygen?

Dissolved oxygen (DO) is a measure of the amount of dissolved oxygen in a system / medium. Measurements are often taken on water samples using a DO probe and meter. When conducting dissolved oxygen testing in the field or laboratory, it is important to consider what type of dissolved oxygen technology is right for you.

Electrochemical sensors include both galvanic and polarographic types. A thin, permeable membrane gas isolates the sensor elements from water. The oxygen that passes through the membrane is reduced, creating a current that the meter converts into a measurement of oxygen concentration. Although electrochemical sensors are initially less expensive, they require frequent maintenance and depend on a constant sample flow for an accurate reading (since they consume the oxygen that permeates through the membrane).

Optical sensors are the other type of common dissolved oxygen sensor measured under the principle of fluorescence quenching. A luminophore that is part of the membrane is excited with the light of a blue LED, emitting in turn a red light. Dissolved oxygen in the sample β€˜turns off’ this excitation.

Laboratory meter Models on Offer


Benchtop pH Meter YR01822

Portable pH / Ion Meter YR01816

Conductivity / TDS / Salinity Meter YR01818

Benchtop pH Meter YR01823

Benchtop Turbidity Meter YR01842

Portable Turbidity Meter YR01841

Multi-Parameter Portable Water Quality Meter

Benchtop TDS / Conductivity Meter YR01830

Our best-selling turbidimeter

YR01841 Portable Turbidity Indicator

High performance portable turbidimeter, 2-5 point calibration, 4 selectable turbidity units. The counter is suitable for process control and field use.

  • High performance portable turbidity meets ISO 7027 design criteria.
    2 to 5 point calibration using formazin standards.
    4 selectable turbidity units, including NTU, FNU, EBC and ASBC.
  • Unique single metering mode automatically detects and locks stable playback.
  • Continuous measurement mode can be used to index or match sample flasks.
  • Automatic power output effectively conserves battery life.

What is your ideal pH meter, multiparameter or turbidimeter?

There are countless models, so it is normal that you do not know which laboratory meters to buy to suit your needs. At Kalstein, we've tested them to find what you're looking for.

Care and Calibration of your pH meter - Kalstein

A pH meter or pH meter is a scientific instrument that measures the activity of the hydrogen ion in aqueous solutions, indicating its degree ...


How does turbidity work? - Kalstein

Turbidity; It is one of the parameters that define the degree to which the water loses its quality of transparency as ...


pH meter: technology and accuracy - Kalstein

Measurement of pH (hydrogen potential) in the laboratory is one of the most important parameters performed for the control ...


pH meter vs. dissolved oxygen meter

The pH electrode has a very high internal resistance, which makes it difficult to measure the voltage variation with pH. Therefore, the impedance of the pHmeter input and leakage resistances are important factors. Basically, the pH meter is a high impedance amplifier that accurately measures the minimum electrode voltages and displays the results directly in pH units on an analog or digital display.


Kalstein Testimonials.

Laboratory meters; Technology and precision.

It is a scientific instrument that measures the activity of the hydrogen ion in aqueous solutions, which indicates its degree of acidity or alkalinity expressed in pH. The pH meter measures the difference in electrical potential between a pH electrode and a reference electrode. This difference in electrical potential is related to the acidity or pH of the solution. The pH meter is used in many applications ranging from laboratory experimentation to quality control.

There are general maintenance techniques for pH meters, but often each make and model has its own attention. We will have to follow the instructions of the counter manufacturer to enjoy it longer.


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