What is an ORP Meter?

ORP is an abbreviation for Oxidation-Reduction Potential. ORP is a measurement that shows how an element can reduce or oxidize another element. The international system unit for ORP is millivolts. We can now say an ORP meter is an instrument that is used to measure the level of substance in terms of reducing or oxidizing another substance.

It’s essential for us to learn how the ORP meter works. A blunt ended surgical instrument known as a probe is placed in water that is pure and free from any bacteria and chemicals, the water is referred to as ozonated water. In the ozonated water we have an electrical conductor used to make contact with a nonmetallic part of the circuit (electrode) which is made of either platinum or gold. The electrode loses its electrons to the oxidizer. The water has many elements, the elements can either be reduced or oxidized, this results to a redox reaction. Allow me to explain the meaning of a redox reaction. A redox reaction is the transfer of electrons between two elements; the element will change by either gaining or losing an electron hence the name redox reaction. The pressure from an electrical circuit’s power source that pushes charged electrons (voltage) is produced. A negative voltage is generated when there is a high concentration of HA. The voltage is positive when there is a high concentration of DHA.

One major advantage of an ORP meter is that it gives out results quickly. Another advantage of the ORP meter is that it gives accurate answers even in different pH levels not forgetting the fact that the probe can endure the voltage being generated from the process. It is said that the probe can endure the pressure of up to 30PSI. Thanks the advance in technology we now have a digital probe. The digital probe is linked to a computer through a data input. The probe has been designed in such a way that it has a visual, audio and alarm systems. The alarm systems of the ORP work similarly as a track device in a car. This alarm signals the owner when it is put to work in a place that is out of range. This is a relief especially to those who own a private ORP. The visual system allows the reaction to be passed to the screen of a computer hence the reaction can be viewed and heard.

As much as the ORP meter has advantages is has its disadvantages as well. The ORP meter works best only in clean water, this is necessary to ensure that the results obtained are accurate. The maintenance of an ORP meter is quite demanding. The cleaning process can cause damage. I can imagine the disappointment one will have after cleaning the equipment and one expects accurate answers only for one to record errors. The reason being just a simple element of the equipment is highly sensitive. If the sensor has been saturated with the sterilizer, it will take a little longer for it to come back to the equal balance with the surrounding water scientifically known as equilibrium.


ORP Meter, Digital ORP Tester Meter,ORP Redox Meter Pen -1999mV~1999mV Millivolts Backlight LCD Aquarium Pool

as of October 1, 2022 9:43 pm


  • Range: -1999~1999mV
  • Resolution: 1mV
  • Accuracy: ±5mV
  • Operating Temperature: 0~50°C
  • Calibration : manual by mini screwdriver (included)

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