Ross Electrodes

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Ross Electrodes
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Thermo Scientific™

Orion™ ROSS™ Electrodes

Fast, accurate pH measurements

The best choice for your pH measurement needs, Thermo Scientific™ Orion™ ROSS™ pH electrodes offer unsurpassed accuracy and trouble-free measurements in a variety of sizes and styles for every application.

All ROSS pH electrodes:

  • Deliver improved measurements
  • Are compatible with any brand of meter
  • Are TRIS compatible for use with most samples, including proteins and sulfides
  • Are mercury and silver free to prevent sample contamination

Download our pH Electrode Selection Handbook


  • ROSS® Ultra Premium pH Electrodes

    Thermo Scientific Orion

    The Orion ROSS® pH electrode, which is recognized as the best pH electrode in the world for difficult samples, is now even better. The Orion ROSS® Ultra has twice the warranty and greater stability than its predecessor. It uses a unique reference system developed by Thermo Scientific that offers…

  • ROSS® Sure-Flow® pH Electrodes

    Thermo Scientific Orion

    …0°-100°C Epoxy Body Combination Electrode recommended for rugged conditions and field use. Epoxy Body Combination Semi-Micro Electrode recommended for small sample volumes and micro/titrations, includes bulb guard. Glass Body Reference Electrode is for all sample types, includes…

  • ROSS® Combination Electrodes

    Thermo Scientific Orion

    Superior stability pH range 0-14 Temperature of 0°-100°C 3 M KCl filling solution supplied with electrode

  • ROSS® Ultra Refillable Glass Triode

    Thermo Scientific Orion

    …Orion™ ROSS Ultra™ pH/ATC Triode™ glass body, refillable pH electrode integrates the ROSS pH reference system and automatic temperature compensation in a versatile electrode for routine laboratory use. Fast to stabilize even with different temperature samples this electrode

  • pH Electrode Solutions

    Thermo Scientific Orion

    Electrode Storage Solution 475 mL plastic bottle pH of solution is 6.2 to 7.4 For short term storage of all electrodes for one day to a week. Electrode Filling Solution Internal filling solution for Ross-type electrodes (3M KCl). In packages of five 50 mL bottles.

  • Orion ROSS® 3-in-1 Triodes

    Thermo Scientific Orion

    …want no electrode maintenance The Thermo Scientific™ Orion™ ROSS Ultra™ Triode™ low maintenance pH electrode integrates the ROSS pH reference system, a fast temperature sensor and a low maintenance gel to achieve both superior performance and extremely long electrode

  • ROSS™ All-in-One™ pH Buffer Kit

    Thermo Scientific Orion

    …bottle of pH 7.00 buffer (910107) 1 pint (475mL) bottle of pH 10.01 buffer (910110) 1 pint (475mL) bottle of ROSS™ pH electrode storage solution (810001) 1 oz. (30mL) bottle of general pH electrode cleaning solution (900023) 12mm diameter pH electrode storage bottle  

  • ROSS PerpHect pH Electrode

    Thermo Scientific Orion

    The Orion ROSS® micro pH electrode is specifically designed to measure small samples. This unique design offers greater durability than conventional micro pH electrodes while providing all the performance benefits of a ROSS® electrode. The refillable glass ROSS micro pH electrode is compatible with…

  • Orion ROSS® Sure-Flow® Sodium Electrodes

    Thermo Scientific Orion

    The Orion 8411BN ROSS™ Sodium and Orion 8611BNWP ROSS Sodium Combination Electrodes allow sodium in aqueous solutions to be measured quickly, accurately, and economically. With its unique redox internal system, the ROSS electrode provides faster response, greater stability and accuracy than…

  • Orion ROSS™ Ultra™ pH Electrodes

    Thermo Scientific Orion

    The ROSS series of electrodes provide readings stable to 0.01 pH in less than 30 seconds, even in the extreme case of samples varying from one another by 50°C or more. Results are three to five times more precise than those obtained with conventional electrodes. And, because drift is less than…

  • ROSS® Ultra Premium pH Electrodes

    Thermo Scientific Orion

    The Orion ROSS® pH electrode, which is recognized as the best pH electrode in the world for difficult samples, is now even better. The Orion ROSS® Ultra has twice the warranty and greater stability than its predecessor. It uses a unique reference system developed by Thermo Scientific that…

  • Orion™ 2001SC ROSS™ Combination pH Electrode

    Thermo Scientific Orion

    …Scientific™ Orion™ 2001SC ROSS™ Combination pH Electrode. Combining pH sensing and reference electrodes, 2001SC provides a fast response for online pH electrodes. The Thermo Scientific Orion 2001SC ROSS Combination pH Electrode is designed to be used in Thermo…

  • ROSS® Ultra reference half-cell electrode with glass body and pin tip connector

    Thermo Scientific Orion

    …of sample composition or temperature. pH response is independent of temperature changes. Electrode Includes a 60 ml bottle of ROSS electrode fill solution, 810007. It is compatible with with 8101BNWP, 8101SC ROSS pH half-cell or 8411BN ROSS sodium half-cell electrodes. Dimensions: 120 x 12mm .

  • Ref Electrode Fill Sol F/Dbl Junct 5X60mL

    Thermo Scientific Orion

    Filling solution for Double Junction, Double Junction KNIpHE™ electrodes. For use with pH electrodes and reference electrodes - only use ROSS filling solution (4153W50) with ROSS™ and ROSS Ultra™ pH electrodes to prevent damaging the ROSS electrodes 60 mL bottle

  • Sodium Ion Electrode

    Thermo Scientific Orion

    ROSS, Half Cell ISE For determination of Na+ ion activity in concentrations from saturated to 10 -6 M (saturated to 0.02 ppm) Model 4210E63 ROSS electrode requires Thomas number 4153Q87 or 0732K95 reference electrode. Uses Orion 900004 fill solution, order as 4153F22. Accessories: Sodium…

  • Pure Water pH Test Kit

    Thermo Scientific Orion

    …etc. Kit includes two 50 mL bottles of pHix adjuster solution, four 475 mL bottles low ionic strength pH 6.97 buffer, two 475 mL bottles low ionic strength pH 4.10 buffer and 1 mL syringe 4153R05 and R08 Thermo Orion ROSS combination pH electrodes are recommended for use with this kit

  • Star™ A211 pH Benchtop Meters

    Thermo Scientific Orion

    …STARA2114 Orion Star A211 pH Benchtop Meter Kit Star A211 pH meter 8172BNWP ROSS Sure-Flow glass-body pH electrode 927007MD stainless steel ATC probe 810199 ROSS pH buffer and solution kit Electrode stand Universal power adapter Literature CD Printed quick start guide …

  • Star™ A221 pH Portable Meters

    Thermo Scientific Orion

    …Batteries; 8107UWMMD ROSS Gel-filled Epoxy pH/ATC Triode with 3 Meter Cable; 910410 pH 4.01 Buffer Pouches; 910710 pH 7.00 Buffer Pouches; 911010 pH 10.01 Buffer Pouches; 810001 ROSS Electrode Storage Solution; 911110 Rinse Solution; STARA-AR Protective Armor with Electrode Holder; STARA-CS Hard…

  • Star™ T910 pH Titrators

    Thermo Scientific Orion

    …literature on USB drive, 110-240V power supplies. START9101 (Thomas No. 1160V90) Orion Star T910 pH Titrator Standard ROSS Kit Includes 8102BNUWP ROSS Ultra pH electrode, 927007MD ATC probe, 20mL burette, stirrer probe, dispenser probe, standard tubing kit, 1L plastic bottle, GL38 bottle…

  • Star A111 pH Benchtop Meter

    Thermo Scientific Orion

    … Attached electrode stand and holder Universal power adapter Printed quick start guide and literature CD STARA1117 Orion Star A111 pH Benchtop Meter ROSS Kit 8157BNUMD Orion ROSS Ultra Triode refillable epoxy-body pH/ATC electrode 810199 Orion ROSS pH buffer and…

  • Star A329 pH/ISE/Conductivity/Dissolved Oxygen Portable Multiparameter Meter

    Thermo Scientific Orion

    …display can show each parameter with temperature individually or all three with temperature on one screen. Additional helpful icons include electrode status, time, date, sample ID, user ID and calibration points. Advanced features such as stability and averaging options provide additional options…

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