Dissolved Oxygen Probes

Dissolved oxygen probes are designed to measure dissolved oxygen concentration within liquid samples, making them essential lab accessories. The probes are suitable for environmental monitoring, assessments of water quality, and fermentation processes.
At Thomas Scientific, we have a great range of optical do probes, DO membranes, and Multiparameter Meters to accommodate a range of laboratory requirements. Some even offer suitability within the field environment.
Dissolved oxygen sensors are manufactured robustly and carry extensive memory functions. The helpful features of a three-color backlight (waterproof and floating in the water) can provide extra time and ensure ultimate efficiency when dealing with complex systems and measurement setups to achieve clear, accurate readings.

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Dissolved Oxygen Meters

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  • Affordable optical RDO technology reduces maintenance time and costs Eliminates costly, tiresome membranes and solutions Rugged, IP67-rated housing for plant and field applications USB and RS-232 output for up to 500 data sets 500 hours battery life, or optional universal power…

  • Easy user-replaceble sensor allows for quick sensor replacements if needed.  No tools necessary. Uses convenient screw-on cap membranes making membrane changes simple and easy Use with the Professional Plus and Pro20 instruments Cables must be ordered separately One-year…

  • The AQ600 is a Portable Dissolved Oxygen meter ideal for use in school laboratories. Dissolved Oxygen measurements are also very important in fish farms and ponds, where Oxygen levels are continuously monitored to obtain optimal reproduction. The AQ600 calibrates easily in 2 points (at 100%…

  • Oakton® probes use galvanic technology to provide rapid results, without any warm-up requirements for field use or economical polarographic technology for BOD use. Includes 50mL of electrolyte solution and one replacement membrane cap. Probe dimensions: 5"L x 0.5" dia (11.5 cm L…

  • The ProSolo ODO/CT kit includes the digital handheld with the optical dissolved oxygen, conductivity, and temperature cable/probe assembly in a soft-sided carrying case. The ODO/CT probe assembly pairs with the ProSolo Handheld to form a complete sampling system. Featuring integral, digital…

  • Usable with all classic grey box and lab meters Measures dissolved oxygen and temperature in B.O.D. bottles Designed to fit into neck of any bottle with a 0.675 inch opening Probe requires manual stirring or use of magnetic stirrer With Membrane and KCl kit. Lead, 1.5 meter (5 ft.).

  • HI6421 includes Hanna's HI7641133 optical dissolved oxygen probe (opdo®) that is based on the principle of fluorescence quenching. An immobilized Pt-based luminophore is excited by the light of a blue LED and emits a red light. As oxygen interacts with the luminophore it reduces the…

  • The YSI ProDSS ODO/CT probe is the first expansion of the ProDSS system. The ODO/CT probe and cable assembly features integral (i.e. built-in) optical dissolved oxygen, conductivity, and temperature sensors and is available in lengths up to 100 meters. It’s perfect for measuring DO in the…

  • Thermo Scientific Orion

    The DO Auto-Stir™ probe is designed for fast and easy BOD analysis with the Thermo Orion 862A DO/BOD/Temperature Meter. The built-in stirrer provides vigorous sample agitation, preventing oxygen stratification and can easily be disassembled for cleaning. The probe stand, which is free…

  • 1213U81 (WD-35640-80): Includes two complete membrane cap assemblies and 50mL of electrolyte solution. 1213U80 (WD-35640-72): Replacement membrane assembly consists of a preassembled membrane, membrane lock, O-ring, and cap. Simply screw replacement membrane assembly onto your probe. …

  • Get the readings that you need where you need them with the Thermo Scientific Orion Star A223 RDO/Dissolved Oxygen Portable Meter. The large, backlit graphic LCD display shows dissolved oxygen in percent saturation or concentration with temperature and electrode status, time, date and…

  • The Thermo Scientific Orion Star A326 pH/RDO/ Dissolved Oxygen Portable Meter is the top choice for advanced measurements on location. Get the information you need quickly and easily from the large, backlit graphic LCD display. Informative display shows individual pH/mV/ RmV or dissolved oxygen in…

  • The S600 SevenExcellence™ DO meter allows users to determine dissolved oxygen content in samples polarographically using any of METTLER TOLEDO's state-of-the art InLab® 605 polarographic dissolved oxygen sensors. The S900 SevenExcellence DO meter allows users to determine…

  • The Pro DIGITAL ODO/T probe and cable assembly features integral optical dissolved oxygen and temperature sensors. Cable lengths are available up to 100 meters. The ODO/T probe assembly pairs with the ProSolo Handheld to form a complete sampling system. Please visit the ProSolo ODO/T Kits …

  • The 626250 can be ordered in lengths of 1, 4, 10, 20, 30, 50, or 100 m. ODO probe and cable assemblies come with an ODO sensor cap. Cables over 1 m also come with a cable management kit. The 626250 optical DO probe and cable assemblies are for the ProODO. Although the 626250 assembly will also work…

  • Robust polarographic dissolved oxygen determination outdoors Robust in design, optimized for one-handed use, and comprising an intuitive menu structure, the new Seven2Go portables offer quality dissolved measurement for laboratory, at-line, and outdoor environments. Simple Menu -…

  • The EcoSense® line of compact, handheld instruments provides the most accurate data in the most affordable format. The instruments feature an easy-to-use interface, one-hand operation, IP67 waterproof case, and low cost of ownership over the life of the product. The DO200A simultaneously…

  • Includes: Pro20 Meter, 4-meter cable with Polarographic DO probe, carrying case, cable management kit

  • OxiTop-i B - OxiTop®-i measuring head blue, menu-operated, with backlit graphic LCD, control LED, operating buttons, for direct BOD readings, volume pre-selection, measurement duration between 1 and 7 days selectable, display of measuring curve, display of current readings.

  • Pro20i Parameters Dissolved Oxygen (DO%, DO Local, mg/L, ppm) Temperature (°C, °F) Barometric Pressure (mmHg, inHg, mbar, psi, kPa) The YSI Pro20i provides everything you need in a handheld dissolved oxygen meter. Ruggedness, simplicity and reliability are the…

  • Dissolved oxygen and temperature field probe and cable assembly. Comes with a 5908 Cap Membrane Kit (1.25 Mil PE membranes).

  • Accurate, economical, handheld dissolved oxygen measurements using optical technology. The EcoSense® line of compact, handheld instruments provides the most accurate data in the most affordable format. The instruments feature an easy-to-use interface, one-hand operation, IP67 waterproof…

  • Handheld dissolved oxygen instrument for the lab or field! 3-year instrument; 2-year cable warranty User-replaceable cables and sensors. Choose polarographic or galvanic for the field or a self-stirring BOD probe for the lab One Touch Cal allows easy DO calibrations within 3 seconds…

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    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…

  • An evolution of the Professional Series water quality meters, the ProSolo DIGITAL handheld replaces the ProODO as YSI’s most advanced optical dissolved oxygen field meter. Paired with the latest optical DO and temperature (ODO/T) probe, the ProSolo benefits from years of expertise in…

  • The YSI probe guard is compatible for use with 550A dissolved oxygen instrument. It is made of sturdy material which ensures durability and long lasting usage.

  • The ProOBOD® self-stirring optical BOD probes are designed to fit into standard 300 mL BOD bottles with an international version also available for use with other tapers. EPA approved for wastewater compliance reporting of BOD and CBOD. The ProOBOD is designed for use with the YSI ProODO…

  • Includes bottle of electrolyte, 1 sanding disc, and 6 screw-on cap membranes. 2.00 mL PE membranes, Blue cap Response Time (T95 - from 0 to 100%) = 17 seconds Flow Dependence After 4 Minutes = 18% Required Flow Rate = 3 inches/second  

  • Thermo Scientific Orion Star A123 Dissolved Oxygen Portable Meters combine simplicity with accuracy. A large LCD displays dissolved oxygen readings along with temperature. Icons provide quick updates on battery life and completed calibration status. Simple button layout and onscreen messages help…

  • Galvanic DO Sensor for use with Professional Plus and Pro20 instruments. Easy user-replaceble sensor allows for quick sensor replacements if needed Comes with six membrane caps and bottle of solution

  • Convenient Portable Dissolved Oxygen Meter for Wherever Your Work Takes You. After more than a century of perfecting the art of measurement through our durable weighing products, OHAUS precision is now available in the form of

  • Easy to use, rugged and reliable, the YSI Pro1020 provides everything you need in a handheld instrument for the measurement of dissolved oxygen, temperature and either pH or ORP. User-replaceable sensors and cables, 50 data set memory, and convenient calibration routine makes it user friendly. A…

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