ROSS™ pH Electrodes

The Best Choice for Superior Stability, Rapid Response, Accurate and Reproducible pH Measurements.

Standard ROSS electrodes provide the same rapid response, accuracy and temperature response of all ROSS electrodes.

The reference system provides excellent stability. These electrodes provide a one year warranty. They are available in a variety of styles such as the clog free Sure-Flow junction, glass or epoxy electrodes, flat surface, semi-micro, micro and spear tip designs.

All standard ROSS electrodes have a refillable design and do not contain a built-in-temperature element.

The Thermo Scientific Orion ROSS electrode line offers a wide variety of quality pH electrodes to choose from. There are many different factors to consider when you selecting a pH electrode to ensure you select the electrode that will suit your needs.

ROSS™ Electrode Specifications:

Slope:

92 to 102% of theoretical Nernst slope

Isopotential Point:

pH 7

Accuracy of measuring a pH 6.86 buffer after standardisation at 25°C:

Accurate within 0.03 pH for buffer at any temperature between 0 to 100°C using automatic temperature compensation

Speed of Response in 6.86 buffer going from 25 to 75°C:

Response stable to 0.01 pH within 30 seconds

Speed of Response between 6.86 and 4.01 buffers at 25°C:

Response stable to 0.002 pH within 15 seconds

Reference System:

Mercury free, TRIS, protein and sulphide compatible

Warranty:

12 months

 

You will need to consider body materials, body styles, and sample requirements. For easy selection, we have broken down the range into several sub-categories, with more information and products on each tab.

ROSS

Standard Glass Electrodes

ROSS Standard Glass Electrodes

ROSS Glass Bodied Electrodes provide precise pH measurements and measurement stability regardless of temperature changes or sample composition. The electrodes are 12mm in diameter, can be used in a wide variety of samples and are easy to clean.

    Catalogue No. Description Price Stock Quantity  
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10282921 Details
PH ELECTRODE ORION ROSS COMBINAT 2804.35 DKK
Estimated Shipment: 25-07-2025
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Product Specifications
For Use With (Equipment) Standard pH Meter, with separate cable with screw cap connector
Length (Metric) 120 mm
Storage Requirements Short-term Storage (up to one week): Soak the electrode in ROSS' pH electrode storage solution, Cat. No. 810001, or standard pH electrode storage solution, Cat. No. 910001. For enhanced electrode performance, use ROSS' pH electrode storage solution. Long-term Storage (more than one week): Fill the reference chamber and securely cover the fill hole. Cover the sensing bulb and reference junction with the protective cap, sleeve or storage bottle containing a few drops of storage solution. Before returning the electrode to use, prepare it as a new electrode.
Type Combination pH Electrode, screw cap connector
Material Glass Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm
Diameter (Metric) Body 12 mm
Connector Types Screw Cap
Includes One 60mL bottle of Orion ROSS filling solution and spout cap
Length (English) Cable 39.37 in.
Drift <0.002 pH/day
Junction Ceramic
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
Length (English) 4.72 in.
Length (Metric) Cable 1 m
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Diameter (English) Body 0.47 in.
10596669 Details

Thermo Scientific™ Orion™ ROSS™ Glass Bodied Combination pH Electrode Connector Types: Screw Cap

 1904.56 DKK
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Product Specifications
Description 800500U ROSS Ultra Reference Electrode
For Use With (Application) Precise pH determinations
Length (Metric) 120 mm
Electrode Reference half-cell glass body electrode; Pin tip connector
Type Reference Electrode
Material Glass Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm
Diameter (Metric) Body 120 mm
Junction Ceramic
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
Filling Solution Type ROSS electrode fill solution
10634131 Details

Thermo Scientific™ Orion™ ROSS Ultra™ Glass Bodied Reference Electrode Length (Metric): 120 mm

 2497.55 DKK
Estimated Shipment: 25-07-2025
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Product Specifications
Includes 60mL bottle of ROSS electrode fill solution
Connector Types S7 Screw Head
Description Combination Sleeve Junction pH Electrode
Drift <0.002pH/day
Type Combination pH Electrode
Precision 0.01
Temperature (Metric) Operating 0°C to 100°C
pH Range 0 to 14
Junction Sleeve
Material Glass Body
Internal Reference ROSS
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Diameter (Metric) Cap 16 mm
10661005 Details

Thermo Scientific™ Orion™ 8162SC ROSS™ Combination Sleeve Junction pH Electrode Connector Types: S7 Screw Head

 3015.70 DKK
Estimated Shipment: 16-07-2025
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Product Specifications
Connector Types Pin-tip
Description 800300 ROSS Sure-Flow Half-Cell
Length (Metric) 120 mm
Type Half-Cell Electrode
Temperature (Metric) Operating 0°C to 100°C
pH Range 0 to 14
Junction Sure-Flow
Material Glass Body
Internal Reference ROSS™
Filling Solution Type 3M KCl
Diameter (Metric) Cap 16 mm
Diameter (Metric) Body 12 mm
10029070 Details

Thermo Scientific™ Orion™ 800300 ROSS™ Sure-Flow™ Half-Cell Connector Types: Pin-tip

 1657.11 DKK
Estimated Shipment: 25-07-2025
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Product Specifications
For Use With (Equipment) Orion ROSS Reference Electrode 800300 or 800500U
Description BNC waterproof connector
Length (Metric) 120 mm
Type Half-Cell Electrode, BNC waterproof connector
Material Glass Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm
Diameter (Metric) Body 12 mm
Connector Types BNC
Drift Drift is less than 0.002 pH per day, restandardization is minimized
Junction Double
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
10615261 Details

Thermo Scientific™ Orion™ ROSS™ Glass Bodied Half Cell pH Electrode Connector Types: BNC

 2092.02 DKK
Estimated Shipment: 23-07-2025
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Product Specifications
For Use With (Equipment) Standard pH Meter, BNC connector
Length (Metric) 120 mm
Storage Requirements Short-term Storage (up to one week): Soak the electrode in ROSS' pH electrode storage solution, Cat. No. 810001, or standard pH electrode storage solution, Cat. No. 910001. For enhanced electrode performance, use ROSS' pH electrode storage solution. Long-term Storage (more than one week): Fill the reference chamber and securely cover the fill hole. Cover the sensing bulb and reference junction with the protective cap, sleeve or storage bottle containing a few drops of storage solution. Before returning the electrode to use, prepare it as a new electrode.
Type Combination pH Electrode, BNC connector
Material Glass Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm
Diameter (Metric) Body 12 mm
Connector Types BNC
Includes One 60mL bottle of Orion ROSS filling solution and spout cap
Length (English) Cable 39.37 in.
Drift <0.002 pH/day
Junction Ceramic
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
Length (English) 4.72 in.
Length (Metric) Cable 1 m
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Diameter (English) Body 0.47 in.
Standard Epoxy Electrodes

ROSS Standard Epoxy Electrodes

ROSS Epoxy Bodied Electrodes provide precise pH measurements and measurement stability regardless of temperature changes or sample composition. The electrodes are 12mm in diameter and the extremely durable, rugged body helps prevent accidental breakage.

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10750055 Details
ROSS EPOXY COMBI PH ELECTRODE BNC 2062.02 DKK
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Product Specifications
Connector Types BNC
Description With BNC connector
Drift <0.002pH/day
Type Combination pH Electrode
Precision 0.01
Temperature (Metric) Operating 0°C to 100°C
pH Range 0 to 14
Junction Glass Fiber
Material Epoxy Body
Internal Reference ROSS
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Sure-Flow Electrodes

ROSS Sure-Flow Electrodes

ROSS Sure-Flow Electrodes incorporate a free-flowing junction that is easy to clean and never clogs. These electrodes are ideal for dirty or viscous samples that clog traditional electrodes.

    Catalogue No. Description Price Stock Quantity  
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10101121 Details

Thermo Scientific™ Orion™ ROSS™ Sure-Flow™ Glass Bodied Combination pH Electrode Connector Types: BNC (Waterproof)

 2947.14 DKK
In Stock
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Product Specifications
For Use With (Equipment) Standard pH Meter, BNC connector
Description Orion ROSS Sure-Flow pH electrode
For Use With (Application) Biological/Pharmaceutical –TRIS buffer, proteins, enzymes; Emulsions – Foods, cosmetics, oils; Emulsions – Petroleum products, paint; General Purpose – Most sample types; High Ionic Strength – Acids, bases, brines, pH > 12 or pH < 2; Low Ionic Strength –
Type Combination pH Electrode, glass body, BNC waterproof connector
Material Glass Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm
Connector Types BNC (Waterproof)
Includes Detachable bulb guard, 2 x 60mL bottles of ORion ROSS electrode fill solution
Precision 0.01
Junction Sure-Flow
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Filling Solution Type 3M KCl (810007)
Temperature (English) Operating 32°F to 212°F
10029150 Details

Thermo Scientific™ Orion™ ROSS™ Sure-Flow™ Epoxy Bodied Combination pH Electrode Connector Types: BNC (Waterproof)

 2886.83 DKK
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Product Specifications
For Use With (Equipment) Standard pH Meter, BNC connector
Description With waterproof connector
Type Combination pH Electrode, epoxy body, BNC waterproof connector
Material Epoxy Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm
Connector Types BNC (Waterproof)
Includes Detachable bulb guard, 2 x 60mL bottles of fill solution
Length (English) Cable 39 in.
Junction Sure-Flow
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
Length (Metric) Cable 1 m
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
10283111 Details

Thermo Scientific™ Orion™ ROSS™ Sure-Flow™ Thin Stem Epoxy Bodied Combination pH Electrode Connector Types: BNC

 3261.75 DKK
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Product Specifications
Description Sure-Flow pH Electrode
Type pH Electrode
Material Epoxy Body
Internal Reference ROSS
Tip Type Semi-micro
Diameter (Metric) Cap 16 mm
Connector Types BNC
Includes Detachable bulb guard, 60mL bottle of ROSS electrode fill solution
Junction Sure-Flow
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Semi-micro Electrodes

ROSS Semi-micro Electrodes

ROSS Semi-micro Electrodes are designed for applications where sample volume is limited and can take measurements in samples of 0.2mL volume. They are available with chemically-resistant glass (6mm tip), epoxy (8mm tip) bodies or Sure-Flow junction.

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10191061 Details
PH ELECTRODE ROSS COMBINATION,withA SEMI-MICRO 2594.40 DKK
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Product Specifications
For Use With (Equipment) Standard pH Meter, BNC connector
Description Semi micro tip
Length (Metric) 165 mm
Storage Requirements To ensure a quick response and free flowing junction, the sensing bulb and reference junction must not dry out. Short-term Storage (up to one week): Soak the electrode in ROSS' pH electrode storage solution, Cat. No. 810001. Long Term Storage (more than one week): Fill the reference chamber and securely cover the fill hole. Cover the sensing bulb and reference junction with the protective cap, sleeve or storage bottle containing a few drops of storage solution.
Type Combination Semi-micro pH Electrode, BNC connector
Material Glass Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm x 95 mm L
Connector Types BNC
Drift <0.002pH/day
Junction Ceramic
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
Length (English) 6.5 in.
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
10589511 Details

Thermo Scientific™ Orion™ ROSS™ Thin Stem Glass Bodied Combination pH Electrode Connector Types: BNC

 3800.55 DKK
Estimated Shipment: 06-08-2025
This item is currently unavailable or has been discontinued.
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Product Specifications
For Use With (Equipment) Standard pH Meter, with separate cable with screw cap connector
Description Semi micro tip
Length (Metric) 165 mm
Storage Requirements To ensure a quick response and free flowing junction, the sensing bulb and reference junction must not dry out. Short-term Storage (up to one week): Soak the electrode in ROSS' pH electrode storage solution, Cat. No. 810001. Long Term Storage (more than one week): Fill the reference chamber and securely cover the fill hole. Cover the sensing bulb and reference junction with the protective cap, sleeve or storage bottle containing a few drops of storage solution.
Type Combination Semi-micro pH Electrode, screw cap connector
Material Glass Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm x 95 mm L
Connector Types Screw Cap
Drift <0.002pH/day
Junction Ceramic
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
Length (English) 6.5 in.
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Micro pH Electrodes

ROSS Micro pH Electrodes

ROSS Micro pH Electrodes have been designed to measure extremely small samples. The measuring tip is 3mm in diameter and  40mm long. The minimum depth of immersion is 4.5mm and the minimum sample size is 15μL in 384 well plates.

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10495933 Details

Thermo Scientific™ Orion™ ROSS™ PerpHecT™ Micro Glass Bodied Combination pH Electrode Connector Types: BNC (Waterproof)

 4453.97 DKK
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Product Specifications
Connector Types BNC (Waterproof)
Description Combination pH Micro Electrode
Length (Metric) 155 mm
Storage Requirements To ensure a quick response and free-flowing liquid junction the sensing element and reference junction must not be allowed to dry out. Short-term Storage (up to one week): Soak electrode in ROSS pH Electrode Storage Solution, Orion 810001 or use pH Electrode Storage Solution, Orion 910001. To minimize the chance of breakage the 8220BNWP should be attached to an electrode stand and suspended in a beaker that contains pH electrode storage solution. The electrode should not touch the sides or bottom of the beaker. Long-term Storage (more than one week): The reference chamber should be filled and the filling hole securely covered. Cover the sensing element and reference Junction with the protective cap/sleeve containing a few drops of storage solution. Before returning the electrode to use, prepare it as a new electrode.
Electrode Glass double junction; Refillable
Drift Less than 0.002 pH units/day
Temperature (Metric) Operating 0°C to 100°C
Junction Glass Double
Material Glass
Length (Metric) Cable 1 m
Min. Immersion 4.5mm
Diameter (Metric) Cap 3 mm
Rugged Bulb Electrodes

ROSS Rugged Bulb Electrodes

ROSS Rugged Bulb Electrodes provide precise pH measurements and measurement stability regardless of temperature changes or sample composition. The electrodes are 12mm in diameter and have an extra durable pH bulb to help prevent breakage.

    Catalogue No. Description Price Stock Quantity  
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10438722 Details

Thermo Scientific™ Orion™ 8104BN ROSS™ Combination Rugged Bulb pH Electrode Connector Types: Screw Cap

 3209.26 DKK
Estimated Shipment: 25-07-2025
This item is currently unavailable or has been discontinued.
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Product Specifications
For Use With (Equipment) Standard pH Meter, with separate cable with screw cap connector
Connector Types Screw Cap
Description With rugged bulb
Drift <0.002pH/day
Type Combination Rugged Bulb pH Electrode, screw cap connector
Precision 0.01
Temperature (Metric) Operating 0°C to 100°C
pH Range 0 to 14
Junction Ceramic
Material Glass Body
Internal Reference ROSS
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Diameter (Metric) Cap 16 mm
10054690 Details

Thermo Scientific™ Orion™ 8104BN ROSS™ Combination Rugged Bulb pH Electrode Connector Types: BNC

 3733.48 DKK
Estimated Shipment: 25-07-2025
This item is currently unavailable or has been discontinued.
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Product Specifications
For Use With (Equipment) Standard pH Meter, BNC connector
Connector Types BNC
Description With rugged bulb
Drift <0.002pH/day
Type Combination Rugged Bulb pH Electrode, BNC connector
Precision 0.01
Temperature (Metric) Operating 0°C to 100°C
pH Range 0 to 14
Junction Ceramic
Material Glass Body
Internal Reference ROSS
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Diameter (Metric) Cap 16 mm
Flat Surface Electrodes

ROSS Flat Surface Electrodes

ROSS Flat Surface Electrodes provide precise pH measurements and measurement stability regardless of temperature changes or sample composition. The electrodes are designed for use in small samples or ideally measuring the surfaces of solid or gel samples.

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10448722 Details

Thermo Scientific™ Orion™ ROSS™ Flat Surface Refillable Epoxy Bodied Combination pH Electrode Connector Types: Screw Cap

 3509.92 DKK
Estimated Shipment: 25-07-2025
This item is currently unavailable or has been discontinued.
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Product Specifications
For Use With (Equipment) Standard pH Meter, with separate cable with screw cap connector
Description With screw cap connector
Storage Requirements Short-term Storage (up to one week): Soak the electrode in ROSS' pH electrode storage solution, Cat. No. 810001, or standard pH electrode storage solution, Cat. No. 910001. For enhanced electrode performance, use ROSS' pH electrode storage solution. Long-term Storage (more than one week): Fill the reference chamber and securely cover the fill hole. Cover the sensing bulb and reference junction with the protective cap, sleeve or storage bottle containing a few drops of storage solution. Before returning the electrode to use, prepare it as a new electrode.
Type Combination Flat Surface pH Electrode, screw cap connector
Material Epoxy Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm
Diameter (Metric) Body 12 mm
Connector Types Screw Cap
Drift <0.002pH/day
Junction Glass Fiber
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Diameter (English) Body 0.47 in.
10468932 Details

Thermo Scientific™ Orion™ ROSS™ Flat Surface Refillable Epoxy Bodied Combination pH Electrode Connector Types: BNC

 2616.90 DKK
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Product Specifications
For Use With (Equipment) Standard pH Meter, BNC connector
Description With BNC connector
Storage Requirements Short-term Storage (up to one week): Soak the electrode in ROSS' pH electrode storage solution, Cat. No. 810001, or standard pH electrode storage solution, Cat. No. 910001. For enhanced electrode performance, use ROSS' pH electrode storage solution. Long-term Storage (more than one week): Fill the reference chamber and securely cover the fill hole. Cover the sensing bulb and reference junction with the protective cap, sleeve or storage bottle containing a few drops of storage solution. Before returning the electrode to use, prepare it as a new electrode.
Type Combination Flat Surface pH Electrode, BNC connector
Material Epoxy Body
Internal Reference ROSS
Diameter (Metric) Cap 16 mm
Diameter (Metric) Body 12 mm
Connector Types BNC
Length (English) Cable 39 in.
Drift <0.002pH/day
Junction Glass Fiber
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Precision 0.01
Length (Metric) Cable 1 m
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Diameter (English) Body 0.47 in.
Spear Tip Electrodes

ROSS Spear Tip Electrodes

ROSS Spear Tip Electrodes provide precise pH measurements and measurement stability regardless of temperature changes or sample composition. The electrodes are designed for use in small samples or ideally piercing solid or semi-solid samples.

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10304721 Details

Thermo Scientific™ Orion™ ROSS™ Semi-Micro Spear Tip Glass Bodied Combination pH Electrode Connector Types: BNC

 3351.73 DKK
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Product Specifications
For Use With (Equipment) Standard pH Meter, BNC connector
Description With BNC waterproof connector
Type Combination Spear Tip pH Electrode, BNC waterproof connector
Length (Metric) Tip 20 mm
Material Glass Body
Internal Reference ROSS
Tip Type Spear
Connector Types BNC
Includes 60mL bottle of ROSS electrode fill solution
Drift <0.002pH/day
Precision 0.01
Junction Ceramic
pH Range 0 to 14
Temperature (Metric) Operating 0°C to 100°C
Filling Solution Type 3M KCl
Temperature (English) Operating 32°F to 212°F
Sample Size 100 μL