Alpha Omega Instruments
- Laboratory and process carbon dioxide analyzers and monitors with measuring ranges from parts per million to high percentage.
- http://www.alphaomegainstruments.org/

SEIBOLD Measurement Engineering
- The product range covers industrial transmitters and amplifiers for measuring pH, Redox (ORP), conductivity, oxygen and multi-parameter online analyzers to detect traces of specific substances and elements. The technologies deployed are ion selective and
- http://www.kappl-seibold.com/

JUMO Instrument Company Ltd
- A company in the field of analytical instrumentation and probe assemblies for liquid measurement. The range of equipment covers conductivity, clean water, pH, redox (orp), dissolved oxygen, chlorine and hydrogen peroxide.
- http://www.jumo.co.uk/

Digital Instruments Corporation
- Manufacturer of ph meter, conductivity meter, TDS meter, ORP indicator controller and other laboratory analytical instruments from India.
- http://www.digitalinstruments.net/

Amoxtec Inc
- Manufacturers of oxygen and gas analyzers, including sensors and monitoring systems for military purposes, bar cellars and pelican cases.
- http://www.amoxtec.com/

D-Opto
- Provides sensors for environmental and scientific research.
- http://www.d-opto.com/

Hanna Instruments Ltd.
- Handheld and bench top models.
- http://www.hannashop.co.uk/

Jenco Instruments
- Manufacturer of pH meters, ORP meters, conductivity meters, dissolved oxygen meters, ion meters and temperature meters. ISO certified manufacturer, CE approved products.
- http://www.jencoi.com

Scientificinstrumentsindia.com
- Indian supplier of a wide range of scientific equipment
- http://www.scientificinstrumentsindia.com

All Gas Detectors.com
- Provides testing and inspection equipment and offers a large selection of gas detectors.
- http://www.allgasdetectors.com/

Micro Probe, Inc.
- Providing metal microelectrodes for neuroscience research, clinical deep brain procedures, and electrochemical applications. Multi-channel electrode arrays and custom design electrode systems are also available. Located in Potomac, Maryland.
- http://www.microprobes.com

Eutech Instruments
- pH meters for the researcher. Integrated temperature probe.
- http://www.eutech.nl/

Elmetron
- Manufacturer of high quality pH meters, conductivity meters, ion meters, thermometers, humidity meters and thickness gauges.
- http://www.elmetron.com.pl/ang

Professional Equipment, Inc.
- Offers handheld meters, analyzers and detectors for gas, moisture, electric and temperature. Includes product overviews and photographs.
- http://www.professionalequipment.com/

Engineered Systems aqnd Designs
- Manufactures pH meters and electrodes; dissolved oxygen and gaseous oxygen meters, electrodes and controllers.
- http://esdinc.com/

Quantek Instruments
- Oxygen analyzers and CO2 analyzers for modified atmosphere MAP testing of food packages, oxygen analyzer for pharmaceutical vial testing.
- http://www.quantekinstruments.com/

EID Corp.
- Manufacture computerized lab equipment; data loggers, electrodes, cells, probes, sensors, buffers, accessories, pH electrodes, Ion Selective Electrodes, ORP electrodes, Conductivity, DO electrodes and temperature sensors.
- http://www.eidusa.com/products.htm

pHionics Inc.
- Submersible transmitters for the control and monitoring of various water quality parameters
- http://www.phionics.com/

Insite Instrumentation Group, Inc.
- Manufacturing of water and wastewater optical dissolved oxygen and suspended solids systems.
- http://www.insiteig.com/

HEITO
- Designs, manufactures and distributes standard and specific electrochemical measuring instruments for laboratories.: pH-meters, redox, conductivity, dissolved oxygen, chlorometers, electrodes and probes.
- http://www.heito.com/

PreSens Precision Sensing GmbH
- Optical sensors and microsensors for dissolved oxygen, oxygen in dry gases and temperature to measure through glass and non-invasive.
- http://www.presens.de/

Erlich Industrial Development, Corporation
- Manufacturer of computerized lab equipment, meters, accessories, data loggers and sensors, including pH, ion selective electrodes, ORP electrodes, conductivity, dissolved oxygen sensors and temperature sensors.
- http://www.eidusa.com/

RMS Supply
- Supplier of electrochemical sensors, pH electrodes, meters, transmitters and pH measurement, conductivity and ion selective electrodes.
- http://www.rmsupply.co.uk

Radiometer Analytical
- Manufacturer of pH and ion meter, potentiometric and Karl Fischer titrator, polarograph for trace analysis, potentiostat and impedance meter. (site traps Netscape)
- http://www.radiometer-analytical.com

CD Hightech Pvt. Ltd
- Manufacturers of laboratory equipment - conductivity meter, pH meter, stirrer, pocket conductivity meter and a unique pocket pH meter.
- http://www.cdhitec.com/

Milwaukee Meters
- pH, EC, TDS, conductivity, redox, thermometers, dissolved oxygen meters.
- http://www.milwaukeemeters.com.au/

Analytical Sensors, Inc.
- Electrochemical sensors: pH, conductivity, ion selective electrodes, dissolved oxygen, and temperature.
- http://www.asi-sensors.com/

Weiss Research
- Manufactures pH electrodes, ISE, ORP electrode, DO, conductivity probes and reference electrode for the laboaratory.
- http://www.weissresearch.com/

Rosemount Analytical Uniloc Division
- Manufacturer of pH sensors, analyzers, transmitters, and dissolved oxygen sensors.
- http://www.rauniloc.com/

Astech Ireland
- Offering TOC, ammonia, sodium, silica, turbidity, BOD, COD, organic halogens, pH, conductivity, flow, and meters.
- http://www.astechireland.ie/

Panametrics Inc.
- Panametrics PCI Division manufactures a complete line of percent and PPM range oxygen analyzers for a wide range of industrial applications.
- http://www.panametrics.com/

Oxygen analyzers
- Describes a product line of trace and percent oxygen analyzers and carbon dioxide analyzers.
- http://www.aoi-corp.org/

Sentronic GMBH (GetSens)
- Develops chemo- and biosensors basing on fluorescence as well as on thin layer effects.
- http://www.getsens.com/

Electro-Chemical Devices, Inc.
- Manufacturer of analytical instrumentation for measurement and control of pH, conductivity, dissolved oxygen, resistivity, and specific ions.
- http://www.ecdi.com/

Strathkelvin Instruments
- Manufacturers of dissolved oxygen measurement instrumentation for laboratory use.
- http://www.strathkelvin.com/

Illinois Instruments
- A manufacturer of process oxygen analyzers, headspace analyzers, and permeation analyzers.
- http://www.illinoisinstruments.com/

Pro-Oceanus Systems, Inc.
- Manufacturers of an Ultra-Stable line of dissolved oxygen, nitrogen and total dissolved air sensors.
- http://www.pro-oceanus.com/

Advanced Sensor Technologies, Inc.
- Manufacturers of pH, ORP and Ion Selective Sensors for difficult process control measurements. ASTI provides complete pH, ORP and ISE loop control systems including analyzers and transmitters, TPC and PID Controllers.
- http://www.astisensor.com/

Delta Ohm Inc.
- Manufactures instruments for the measuring temperature, relative humidity, pressure, light, noise, pH, conductivity and dissolved oxygen.
- http://www.deltaohm.com/

IQ Scientific Instruments
- Non-glass pH systems with ISFET silicon-chip sensor technology and ion-selective probes.
- http://www.phmeters.com/

Advanced Micro Instruments
- Manufacturer of trace and percent oxygen analyzers. Full specifications of company products online.
- http://www.amio2.com/

Nico2000 Ltd
- Ion selective probes, cation as well as anion selective probes and instrumentation. Computer and data acqusition hardware.
- http://www.nico2000.net

ElectrodesDirect.com
- Supplier of replacement pH, ORP, conductivity, dissolved oxygen, ion selective, and biotechnology electrodes and assemblies.
- http://www.electrodesdirect.com/