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Oxidation-Reduction Potential (ORP) or Redox potential measurements are used to monitor chemical reactions, to quantify ion activity, or to determine the oxidizing or reducing properties of a solution. ORP is a measurement of the electrical potential of a redox reaction and serves as a yardstick to judge how much oxidation or reduction takes place under existing conditions.

ORP electrodes measure the voltage across a circuit formed by the measuring metal half cell and the reference half cell. When the ORP electrode is placed in the presence of oxidizing or reducing agents, electrons are constantly transferred back and forth on its measuring surface, generating a tiny voltage. The ORP measurement can be made using the millivolt mode of a pH meter.

Major areas of usage include the treatment of industrial wastes, study of biological systems, oxidation of cyanide, bleaching of pulp, manufacture of bleach and reduction of chromate wastes. The measurement of ORP is also useful in pool water treatment as an indication of sanitation in relation to free chlorine parameter.

Eutech offers a wide range of ORP meters that measure both pH and ORP values in various educational, laboratory and industrial applications. These include ORPTestr10 pocket tester, portable
meters CyberScan Series pH 300, pH 310, pH 11 and pH 110, EcoScan pH 6 and the CyberScan
bench meter series 510, 1100, 2100, 1500 and the colour touchscreen research-grade series 6000.

Browse by product type:
Pocket-Sized Testers
Economy Handhelds
Standard Handhelds
Waterproof Handhelds
Bench Meters
Process Electrodes
Laboratory Electrodes

Pocket-Sized Testers

Model
Meter
Highlights
Parameter
Range
Memory

Platinium ring
electrode

mV

-999 to +1000 mV

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Economy Handhelds

Model
Meter
Highlights
Parameter
Range
Memory

Economical
pH, ORP
measurement

pH/mV/C

0.00 to 14.00 pH

No

Economical
pH, ORP
measurement

pH/mV/C

0.00 to 14.00 pH

No

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Standard Handhelds

Model
Meter
Highlights
Parameter
Range
Memory

Standard Portable

pH/mV/C

-2.00 to 16.00 pH

50 data sets

Expanded
memory, RS232
output

pH/mV/C/F

-2.00 to 16.00 pH

100 data sets

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Waterproof Handhelds

Model
Meter
Highlights
Parameter
Range
Memory

Waterproof
Portable

pH/mV/C

-2.00 to 16.00 pH

16 data sets

Waterproof,
GLP

pH/mV/C/F

-2.00 to 16.00 pH

50 data sets

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Standard Bench

Model
Meter
Highlights
Parameter
Range
Memory

Dual display
standard bench

pH/mV/C

0.00 to 14.00 pH

50 data sets

Deluxe Bench

Model
Meter
Highlights
Parameter
Range
Memory

Back-lit dual-
display

pH/mV/C/F

-1.000 to
14.000 pH

100 data sets

Back-lit dual-
display Ion
concentration
measurement

pH/mV/Ion/C/F

-1.000 to
14.000 pH

100 data sets

Premium Bench

Model
Meter
Highlights
Parameter
Range
Memory

Extensive display

pH/mV/C/F

-1.999 to
19.999 pH

100 data sets

Windows
CE-driven
single channel colour touchscreen (with pH FET)

pH/mV/
C/F

-2.000 to
20.000 pH

10,000 data sets

Windows
CE-driven
single channel colour touchscreen (with pH FET)

pH/mV/Ion/
C/F

-2.000 to
20.000 pH

10,000 data sets

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Process Electrodes

Model
ORP
Range
Operating
Temperature
Pressure Tolerance
Potential
Matching Pin

±1000 mV

0 to 80 °C /
32 to 176 ºF

6 bar
(87 psi)

Platinum

±1000 mV

0 to 80 °C /
32 to 176 ºF

6 bar
(87 psi)

Platinum

±1000 mV

-5 to 95 °C /
23 to 203 ºF

6.9 bar
(100 psi)

SS316

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Laboratory Electrodes

Model
ORP
Range
Temperature
Range
Sensor
Type
Reference
Type

-1000 to 1000 mV

0 to 80 °C

Platinum pin

Ag/AgCl
sealed

-1000 to 1000 mV

0 to 80 °C

Platinum pin

Ag/AgCl
sealed

-1000 to 1000 mV

0 to 80 °C

Platinum pin

Ag/AgCl
refillable

-1000 to 1000 mV

0 to 80 °C

Platinum pin

Ag/AgCl
refillable

-1000 to 1000 mV

0 to 100 °C

Platinum band

Ag/AgCl
refillable

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