pH Meters

A pH meter is an instrument designed to measure the hydrogen-ion level in water based solutions. A pH meter indicates the acidity and alkalinity and is sometimes also referred to as a potentiometric pH meter.


A pH meter works by measuring the voltage between two electrodes. The results are displayed by converting this information into a pH value.


The term 'pH' refers to a unit of measure with a range between zero and fourteen. The mathematical symbol 'p' represents potential, while the 'H' is the symbol for hydrogen.


Applications


    Harsh environments

    Biological micro-environments

    Laboratory experimentation

    Quality control

    Agriculture

    Municipal water supplies

    Brewing industry

    Swimming pools

    Food industry

Replacement parts are available, such as pH electrodes made from a special glass composed of alkali metal ions which sense the hydrogen ion concentration. As the electrode ages, the glass electrodes resistance changes.


pH meter calibration is required as electrodes run down eventually and need to be calibrated on a regular basis. Calibration in a pH buffer solution which has a constant pH value should always start with buffer 7.0 as this is point ’zero’. The pH scale has an equivalent mV scale from +420 mV to -420 mV. The buffer solution is available as a pre-mixed liquid or dry powder capsules.


What types of meters are there?


Pocket testers are a device with an LCD display which can deliver fast and accurate readings. They are lightweight and easy to transport making them ideal for field use. Pocket tester meters are popular with students and researchers which they use for measurements in test tubes and vials. Features of a pocket tester meter include automatic buffer recognition, easily replaceable electrodes and thousands of hours of battery life.


Portable pH meters are handheld and lightweight. They contain Bluetooth technology which allows the information to be downloaded to a mobile or tablet. Multi-parameter meters are suited to robust industrial environments and have PC connectivity.


Bench meters are accurate, easy to use and available with Bluetooth technology and built-in printers. It is easy to transfer data via Bluetooth onto a mobile or tablet, or onto a PC via a USB cable.


Test kits measure the strength or weakness of a chemical presence by the degree of colour saturation. If pale then the concentration is low, if strong then the concentration is high. Adding the reagent to the compound allows the colour to be tested against a colour chart.


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Viewing 1 - 20 of 24 products
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Description Price Maximum pH Minimum pH pH Resolution Best pH Accuracy Maximum Temperature Measurement Minimum Temperature Measurement Temperature Measurement Resolution Best Temperature Measurement Accuracy Maximum Conductivity Minimum Conductivity Conductivity Resolution Best Conductivity Accuracy Maximum Oxidation Reduction Potential Minimum Oxidation Reduction Potential
RS Stock No. 410-0918
Mfr. Part No.HI-98128
kr 1 067,99
Each
Units
+16pH -2pH 0.01pH ±0.05pH +60 °C -5°C 0.1°C ±0.5 °C - - - - - -
RS Stock No. 375-1830
Mfr. Part No.PRIMO
kr 372,60
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 410-0902
Mfr. Part No.HI98127
kr 903,68
Each
Units
+16pH -2pH 0.1pH ±0.1pH +60 °C -5°C 0.1°C ±0.5 °C - - - - - -
RS Stock No. 214-855
Mfr. Part No.HI98103
kr 410,76
Each
Units
+14pH 0pH 0.01pH ±0.2pH - - - - - - - - - -
RS Stock No. 366-6186
Mfr. Part No.HI991300
kr 5 329,16
Each
Units
+14pH 0pH 0.01pH ±0.01pH +60 °C 0°C 0.1°C ±0.5 °C 3999µS/cm 0µS/cm 1µS/cm ±2% - -
RS Stock No. 218-970
Mfr. Part No.HI-98107
kr 621,58
Each
Units
+14pH 0pH 0.1pH ±0.1pH - - - - - - - - - -
RS Stock No. 724-3677
Mfr. Part No.HI 9811-5N
kr 1 910,05
Each
Units
+14pH 0pH 0.1pH ±0.1pH +70 °C 0°C 0.1°C ±0.5 °C 6000µS/cm 0µS/cm 10µS/cm ±2% - -
RS Stock No. 410-0930
Mfr. Part No.HI-991301N
kr 5 627,47
Each
Units
+14pH 0pH 0.01pH ±0.01pH +60 °C 0°C 0.1°C ±0.5 °C 20mS/cm 0mS/cm 0.01mS/cm ±2% - -
RS Stock No. 434-2358
Mfr. Part No.HI98129
kr 1 571,17
Each
Units
+14pH 0pH 0.01pH ±0.05pH +60 °C 0°C 0.1°C ±0.5 °C 3999µS/cm 0µS/cm 1µS/cm ±2% - -
RS Stock No. 726-2696
Mfr. Part No.HI-991001N
kr 3 748,22
Each
Units
+16pH -2pH 0.01pH ±0.02pH +105 °C -5°C 0.1°C ±0.5 °C - - - - - -
RS Stock No. 724-3689
Mfr. Part No.HI 9813-5N
kr 1 910,05
Each
Units
+14pH 0pH 0.1pH ±0.1pH +60 °C 0°C 0.1°C ±0.5 °C 4mS/cm 0mS/cm 0.01mS/cm ±2% - -
RS Stock No. 434-2364
Mfr. Part No.HI98130
kr 1 571,17
Each
Units
+14pH 0pH 0.01pH ±0.05pH +60 °C 0°C 0.1°C ±0.5 °C 20mS/cm 0mS/cm 0.01mS/cm ±2% - -
RS Stock No. 479-8492
Mfr. Part No.0563 2061
BrandTesto
kr 1 495,00
Each
Units
+14pH 0pH 0.01pH ±0.02pH +60 °C 0°C 0.1°C ±0.4 °C - - - - - -
RS Stock No. 387-4400
Mfr. Part No.HI2211-02
kr 4 857,28
Each
Units
+16pH -2pH 0.01pH ±0.01pH +120 °C -9.9°C 0.1°C ±0.5 °C - - - - +2000 mV, +399.9 mV -2000 mV, -399.9 mV
RS Stock No. 610-9030
Mfr. Part No.HI 83141
kr 2 824,00
Each
Units
+14pH 0pH 0.01pH ±0.01pH +100 °C 0°C 0.1°C ±0.4 °C - - - - +1999mV -1999mV
RS Stock No. 314-4692
Mfr. Part No.HI981402-02
kr 893,41
Each
Units
+14pH 0pH 0.1pH ±0.2pH - - - - - - - - - -
RS Stock No. 512-0373
Mfr. Part No.0563 2065
BrandTesto
kr 2 750,00
Each
Units
+14pH 0pH 0.01pH ±0.02pH +60 °C 0°C 0.1°C ±0.4 °C - - - - - -
RS Stock No. 518-4967
Mfr. Part No.HI 83141
kr 3 970,05
Each
Units
+14pH 0pH 0.01pH ±0.01pH +100 °C 0°C 0.1°C ±0.4 °C - - - - +1999mV -1999mV
RS Stock No. 517-5070
Mfr. Part No.HI 9812-5
kr 1 884,73
Each
Units
+14pH 0pH 0.1pH ±0.1pH +60 °C 0°C 1°C ±1 °C 1990µS/cm 0µS/cm 10µS/cm ±2% - -
RS Stock No. 410-1400
Mfr. Part No.HI-991300N
kr 5 627,47
Each
Units
+14pH 0pH 0.01pH ±0.01pH +60 °C 0°C 0.1°C ±0.5 °C 3999µS/cm 0µS/cm 1µS/cm ±2% - -
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