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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 are Total Dissolved Solids (TDS)

Total Dissolved Solids (TDS) are solids in water that can pass through a filter. TDS is a measure of the amount of material dissolved in water. This material can include carbonate, bicarbonate, chloride, sulphate, phosphate, nitrate, calcium, magnesium, sodium, organic ions, and other ions.

For more information on Total Dissolved Solids (TDS), please visit our technical area

How Can TDS be Measured?

The method most commonly used for the analysis of TDS is the measurement of specific conductivity with a conductivity probe that detects the presence of ions in water. Conductivity measurements are then converted to TDS values. The practical quantisation limit for TDS in water by this method is 10 mg/L. High TDS concentrations can also be measured gravimetrically, although this method excludes volatile organics. The constituents of TDS can also be measured individually.

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

Portable Hand Held Instruments:

Our EcoScan compact palm-top TDS meters are economically priced, user-friendly and simple-to-use features such as : Microprocessor based, easy and quick push button calibration, auto ranging, automatic temperature compensation (ATC), easy to read custom LCD, hold function, auto power off and self diagnostic.

Please Click on the picture below to view in detail:







Outdoor & Field Applications: 


Choose from our range of TDScan Total Dissolved Solids (TDS) Testers. This range of unique IP67 pocket-sized waterproof portable TDS meters have 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, Microprocessor based functions for fast and stable readings.

Please Click on the picture below to view in detail:


Waterproof Portable:

The CyberScan TDS Meters are an ideal choice for anyone requiring to take TDS measurements in rugged outdoor field work or in situ Plant and Process applications - being waterproof and robustly built, the chance of accidental damage is virtually eliminated.  Not only is this instrument waterproof but in the event of accidentally dropping it into liquid, it will float to facilitate easy retrieval.

Please Click on the picture below to view in detail:







Laboratory Applications: 

Choose from our wide range of Bench TDS meters, from the low cost, high specification CyberScan CON510 through to our top of the range touch-screen CyberScan CON1500. Incorporating advanced programmable features to suit the demands of today's scientist these meters make laboratory TDS testing procedures routine with user-customisable options. The CyberScan CON1500 has expanded Memory and can store and recall up to 100 data sets

Please Click on the picture below to view in detail:






Plant & Process Applications:

Our Alpha CON2000 is our top of the range industrial TDS process control instrument. These controllers can be wall-mounted or panel-mounted, are equipped with advanced menu-driven incorporated with a myriad of user-customizable features. Features include built-in PI/proportional control, scaleable current output for fine control, 2 independent set-points, alarm with timer control and programmable wash cycle. Output is scaleable for fine control, there is also hysteresis protection and noise grounding functions, etc.

Please Click on the picture below to view in detail:







Replacement Sensors and Ancillaries:

At R.M.S Ltd we can supply replacement TDS 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 Conductivity 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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