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  • ORP Meters
ORP Meters

ORP is typically measured to determine the oxidizing or reducing potential of a water sample. It indicates possible contamination, especially by industrial wastewater. ORP can be valuable if the user knows that one component of the sample is primarily responsible for the observed value. For example, excess chlorine in wastewater effluent will result in a large positive ORP value and the presence of hydrogen sulfide will result in a large negative ORP value.

ORP is determined by measuring the potential of a chemically-inert (platinum) electrode which is immersed in the solution. The sensing electrode potential is read relative to the reference electrode of the pH probe and the value is presented in millivolts (mV).

The determination of ORP is generally significant in water which contains a relatively high concentration of a redox-active species, e.g., the salts of many metals (Fe2+, Fe3+) and strong oxidizing (chlorine) and reducing (sulfite ion) agents. Thus, ORP can sometimes be utilized to track the metallic pollution in groundwater or surface water or to determine the chlorine content of wastewater effluent. However, ORP is a nonspecific measurement, i.e., the measured potential is reflective of a combination of the effects of all the dissolved species in the medium. Because of this factor, the measurement of ORP in relatively clean environmental water (ground, surface, estuarine, and marine) has only limited value unless a predominant redox-active species is known to be present.

The value of ORP in determining the content of environmental water is greatly enhanced if the user has some knowledge or history of the site. ORP data can typically become more useful if used as an indicator over time and/or with other common parameters to help develop a complete picture of the water quality being tested.


ORP Meters

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Extech 341350A-P Oyster™ Series pH/Conductivity/TDS/ORP/Salinity Meter
Extech 341350A-P Oyster™ Series pH/Conductivity/TDS/ORP/Salinity Meter
Oyster™ meter with mini pH electrode and Polymer conductivity cell341350A-P is a pH/Conductivity/T...
Rp.13,250,000
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HACH ensION+ MM150 Portable pH/ORP/EC Kit With pH/ORP/EC/Temperature Multi-Sensor 5048
HACH ensION+ MM150 Portable pH/ORP/EC Kit With pH/ORP/EC/Temperature Multi-Sensor 5048
Fast results: Provided by the right choice of quickly ...
Rp.28,750,000
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HACH ensION+ MM156 Portable pH/Conductivity/Dissolved Oxygen Kit with Multi-Sensor 5049
HACH ensION+ MM156 Portable pH/Conductivity/Dissolved Oxygen Kit with Multi-Sensor 5049
Fast results: Provided by the right choice of quickly ...
Rp.45,500,000
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HACH sensION+ PH31 (LPV2100.97.0002) Advanced GLP Benchtop pH & ORP Meter
HACH sensION+ PH31 (LPV2100.97.0002) Advanced GLP Benchtop pH & ORP Meter
The Hach sensION+ PH31 GLP benchtop pH meter measures pH from -2 to 16, ORP from -2000 to 2000 mV,...
Rp.21,750,000
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HANNA HI2209 pH/mV Benchtop Meter
HANNA HI2209 pH/mV Benchtop Meter
The HI2209 is a basic, affordable pH/mV benchtop meter designed for simplicity of use. Manual ca...
Rp.12,600,000
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HANNA HI2216 pH/ISE/ORP/°C Benchtop Meter with 0.001 Resolution
HANNA HI2216 pH/ISE/ORP/°C Benchtop Meter with 0.001 Resolution
The HI2216 is an accurate and affordable pH/ISE/ORP/°C benchtop meter with 0.001 pH and ISE resolu...
Rp.21,500,000
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HANNA HI3220 pH/ORP Benchtop Meter
HANNA HI3220 pH/ORP Benchtop Meter
The HI3220 is a professional pH/ORP and temperature benchtop meter with a single input channel. Th...
Rp.20,950,000
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HANNA HI3221 pH/ORP/ISE Single Channel Benchtop Meter
HANNA HI3221 pH/ORP/ISE Single Channel Benchtop Meter
The HI3221 is a professional multiparameter benchtop meter. Offering a single input channel, this ...
Rp.24,500,000
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HANNA HI3222 pH/ORP/ISE Dual Channel Benchtop Meter
HANNA HI3222 pH/ORP/ISE Dual Channel Benchtop Meter
The HI3222 is a professional multiparameter benchtop meter. Offering two input channels, this mete...
Rp.26,500,000
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HANNA HI3512 Multiparameter pH/ORP/ISE and EC/TDS/Resistivity/Salinity Benchtop Meter
HANNA HI3512 Multiparameter pH/ORP/ISE and EC/TDS/Resistivity/Salinity Benchtop Meter
The HI3512 is a professional, accurate multiparameter benchtop meter. Offering two input channels,...
Rp.28,700,000
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HANNA HI5521 Research Grade pH/ORP and EC/TDS/Salinity/Resistivity Meter with CAL Check
HANNA HI5521 Research Grade pH/ORP and EC/TDS/Salinity/Resistivity Meter with CAL Check
The HI5521 is an advanced research grade benchtop pH/mV/EC/TDS/Salinity/Resistivity meter that is ...
Rp.24,700,000
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HANNA HI5522 Research Grade pH/ORP/ISE and EC/TDS/Salinity/Resistivity Meter with CAL Check
HANNA HI5522 Research Grade pH/ORP/ISE and EC/TDS/Salinity/Resistivity Meter with CAL Check
The HI5522 is a two-channel meter that allows for simultaneous measure of pH, ORP, or ISE on one c...
Rp.26,850,000
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HANNA HI9126 Waterproof Portable pH/mV Meter with CAL Check™
HANNA HI9126 Waterproof Portable pH/mV Meter with CAL Check™
The HI9126 is a rugged, portable pH and mV meter designed to provide laboratory precision and accu...
Rp.13,500,000
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HANNA HI98121 ORP/pH/Temperature Tester
HANNA HI98121 ORP/pH/Temperature Tester
The pHep® pH meter revolutionized the industry by providing non-technical personnel with a simpl...
Rp.2,500,000
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HANNA HI98191 Waterproof Portable pH/ORP/ISE Meter
HANNA HI98191 Waterproof Portable pH/ORP/ISE Meter
The HI98191 is a rugged, portable pH/ORP/ISE meter with the performance and features of a benchtop...
Rp.18,500,000
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HANNA HI98195-04 Multiparameter pH/ORP/EC/Pressure/ Temperature Waterproof Meter,4m Cable
HANNA HI98195-04 Multiparameter pH/ORP/EC/Pressure/ Temperature Waterproof Meter,4m Cable
The HI98195 is a waterproof portable logging multiparameter meter that monitors up to 10 different...
Rp.23,950,000
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HANNA HI98196-10 Multiparameter pH/ORP/DO/Pressure/ Temperature Waterproof Meter,10m cable
HANNA HI98196-10 Multiparameter pH/ORP/DO/Pressure/ Temperature Waterproof Meter,10m cable
The HI7698196 is a multiparameter pH/EC/Temperature probe for use with the HI98196 portable mete...
Rp.28,950,000
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HANNA HI98196-20 Multiparameter pH/ORP/DO/Pressure/ Temperature Waterproof Meter, 20m cable
HANNA HI98196-20 Multiparameter pH/ORP/DO/Pressure/ Temperature Waterproof Meter, 20m cable
The HI7698196 is a multiparameter pH/EC/Temperature probe for use with the HI98196 portable mete...
Rp.31,500,000
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HANNA HI98196-4 Multiparameter pH/ORP/DO/Pressure/ Temperature Waterproof Meter, 4m cable
HANNA HI98196-4 Multiparameter pH/ORP/DO/Pressure/ Temperature Waterproof Meter, 4m cable
The HI7698196 is a multiparameter pH/EC/Temperature probe for use with the HI98196 portable mete...
Rp.26,600,000
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HANNA HI98196-40 Multiparameter pH/ORP/DO/Pressure/ Temperature Waterproof Meter,40m cable
HANNA HI98196-40 Multiparameter pH/ORP/DO/Pressure/ Temperature Waterproof Meter,40m cable
The HI7698196 is a multiparameter pH/EC/Temperature probe for use with the HI98196 portable mete...
Rp.37,600,000
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