A pH meter is a precise voltmeter that measures the potential
difference, in thousandths of a volt (mV), between the reference
electrode and the measuring pH electrode. It's scaled in such a way
that it displays not the measured potential, but converts it to a
display of pH.
According to Nernst equation a standard pH electrode generates a
voltage of about 59 mV per pH, and at pH 7 (neutral pH) the
electrode produces 0 volts. Acids produce positive and bases
Though there are many types of pH meters, common varieties will
come with calibration liquids called buffer solutions. These
solutions are predetermined to be highly acidic (4.01), neutral
(7.01), and alkaline or base (10.01).
Calibration is accomplished by testing the liquids with the probe
and adjusting the meter’s readings. A pH meter should be
recalibrated monthly for best results. When not in use, the tip of
the probe must be stored in acidic solution. If the probe dries
out, it will need replacement.
Water quality controllers commonly use pH meters. Other types of
meters test solids like soil or even foods. Many aquarists use pH
meters in lieu of liquid testing. The probe can be placed
permanently in an aquarium sump and the meter, mounted inside the
aquarium stand or on a nearby wall. Freshwater cichlids and
saltwater fish require alkaline water, while African Nile fish
thrive in acidic freshwater. In an aquarium, pH fluctuation can
cause illness or death to fish, so monitoring pH closely is
There are three different types of pH meters: portable, bench and
• Portable devices are great when you need to perform measurements
outside the laboratory. Portable pH tester should be ergonomic,
rugged and versatile.
• Bench tester is usually more precise and has more options. They
are typically used in a laboratory where an interface for data
communication and advance measurement features are important.
• In-line pH transmitters for process control are designed to with
stand harsh environments.
A pH tester needs to be calibrated in order to correct for any
deviation of the electrodes from their ideal behavior.
|Accuracy||±0.1 PH(at 20°C/ 68°F)|
|Batteries||3*1.5V ( AG-13 Button Battery)|
|Life||approx 700 hours of use|
|Relative Humidity||less than 95%|
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