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Instruments, Controllers & Sensors




Portable Turbidity meters

Bench Turbidity meters

Online Turbidity

Flame Photometry

BWB-1 Flame Photometer

Dissolved Oxygen (DO)

Handheld Dissolved Oxygen IP67 Dissolved Oxygen Meters

Bench Dissolved Oxygen Meters

Industrial Dissolved Oxygen 

Dissolved Oxygen Probes

DO Probe Conditioner


Portable pH Testers

Handheld pH Meters

Waterproof pH Meters

Bench pH Meters

Industrial pH Controllers

Replacement pH Electrodes


Free Chlorine

Total Chlorine

Cyanuric Acid

Redox (ORP)

Portable Redox Testers

Handheld Redox Meters

Waterproof ORP Meters

Bench ORP Meters

Industrial ORP Controllers

Replacement Metal ORP Probes

Conductivity (EC)

Portable Conductivity Testers

Handheld Conductivity Meters

Waterproof Conductivity Meters

Bench Conductivity Meters

Industrial Conductivity Meters

Replacement Conductivity Cells

Total Dissolved Solids (TDS)

Portable TDS Testers

Handheld TDS Meters

Waterproof TDS Meters

Bench TDS Meters

Industrial TDS Controllers

Replacement Cells

Ion Concentration

Handheld Ion Meters

Waterproof Ion Meters

Bench Ion Meters

Ion Selective Electrodes (ISE)


Portable Salinity Testers

Handheld Salinity Meters

Bench Salinity Meters

Salinity Sensors

Multi-parameter Bench Meters


Please click above to view this range


Multifunctional Controller


Chlorine Dioxide

Paracetic Acid

Hydrogen Peroxide 



Bench Resistivity Meters

Industrial Resistivity Controller

Resistivity Cells

Electrochemical Sensors

pH, Reference, Conductivity, Redox, Dissolved Oxygen, Ion Selective Electrodes, Calibration Solutions, Hollow Cathode Lamps and

Deuterium Lamps

What is Salinity ?

Salinity refers to the concept of saltiness of a body of water. Water is defined as saline if it contains 3 to 5% salt by volume. The ocean is naturally saline at ~3.5% salt (see sea water). Some inland salt lakes (seas) are even saltier. The technical term for ocean saltiness is halinity, from the fact that halides (chloride, specifically) are the most abundant anion in the mix of dissolved solids. In oceanography, it has been traditional to express salinity as concentration in parts per thousand (ppt or o/oo), which is grams salt per litre of water.

For more information on Salinity Measurement, please visit our technical area

How Can Salinity be Measured?

Salinity can be measured in the laboratory using a bench Salinity Meter, in outdoor and field applications a portable Salinity Meter would be used.  

What products do R.M.S Ltd offer for Salinity Measurement?

Portable Hand Held Instruments:

The R.M.S EcoScan Salt 6 Portable Salinity Meter is ideal for fish farms (marine fish) and fish ponds (koi), pool water, aquaculture systems, aquariums, food processing and healthcare industries. The meter offers the user an accurate and reliable Salinity meter with user friendly functions with an accuracy of 1% full scale.

Please Click on the picture below to view in detail:







Outdoor & Field Applications: 


Our SALTScan Salinity waterproof portable tester are used in aquariums, hobbyists (koi fish), aquaculture and fish-farms, water and wastewater treatment, pool and spas. having many advanced features such as waterproof, dustproof housing IP67 rated - maintains the integrity of your tester even in harsh field conditions, Automatic Temperature Compensation (ATC) - ensures optimum accuracy under fluctuating temperatures, Factory calibrated against NaCl standards - ideal for testing salinity levels.

Please Click on the picture below to view in detail:







Laboratory Applications: 

Our CyberScan multi-function Analytical Laboratory instruments offer the user the ability to measure a range of different parameters. You can choose from our competitively priced CyberScan PC510 giving you the option to measure pH, Conductivity, TDS & Temperature through to our top of the range CyberScan PCD5000 offering pH, mV, Ion, DO, BOD (Biological Oxygen Demand), Conductivity, Salinity, TDS, Resistivity & Temperature all from the same instrument!  

Please Click on the picture below to view in detail:







Replacement Sensors and Ancillaries:

At R.M.S Ltd we can supply replacement Salinity Cells for both Industrial and Laboratory applications that are compatible with all modern instruments. All of our electrochemical sensors can be supplied with or with out temperature compensation. All we need is the make and model of your Salinity meter so that we can determine the correct connector etc - please email, phone or fax us with your requirements and one of our team will contact you. 

Please Click on the picture below to view in detail:

Sentek Conductivity Cell







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We are proud to announce the launch of the Worlds First CFR 21 Compliant - Windows CE Driven Multi-Parameter 6000 Range of Bench Meters. Ideal for use in industries such as Pharmaceutical, Food & Drug Manufacture and Health & Human Services. Please click here for details.

We accept all major credit/debit cards - please contact us for our best possible prices!; any questions? Why not try our Technical Area where you will find an in-depth explanation of many relevant aspects within the field of electrochemistry! more..


Russell Mainstream Supply Ltd.


Cameron House, 8 Crown Square, Kingskettle, Cupar, Fife, KY15 7PW


Phone: +44 (0)1337 831192

Fax: +44 (0)1337 371192


Email: Sales@rmprocesscontrol.co.uk 



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