Here at Gem Scientific, we offer high-quality water testing equipment from a range of trusted brands including Hanna Instruments, Hydrosense, Idexx, Rotronic, Schaller and Aqualab. Our range offers products to suit an array of different budgets, allowing you to tailor your order to suit your individual requirements.

Designed to help you to complete your tasks to the highest possible standard, our water testing products come as part of a wider range of equipment that ensures the smooth running of your laboratory or workplace.

Our range of water testing equipment can be used within a wide range of industries, making it a versatile piece of equipment for your workplace. Our selection features legionella testing, benchtop water activity meters, handheld water activity meters and Idexx water microbiology testing and water sampling. Browse water testing meters, vessels, kits and analysers to find a product that best fits your requirements and provides you with an accurate reading time and time again.

  • Water Activity
    At Gem Scientific, we are proud to deliver an expert range of water activity meters, essential for food safety, quality control, and shelf-life assurance. Water activity (a_w) refers to the amount of unbound water in a product—a critical variable that impacts microbial growth, texture, stability, and nutritional quality. Measuring wtaer activity accurately allows food manufacturers to predict microbial risk, reduce spoilage, and support HACCP protocols across production and storage environments. Our product lineup includes advanced models such as the Aqualab Series 4TE water activity meter, as well as the Schaller Humimeter RH2 analyser, each designed for precision and ease of use. If you need help selecting the right water activity solution for your process, our knowledgeable team is ready to advise.
  • Specific Water Testing
    Specific water testing enables the targeted detection of harmful microorganisms and contaminants in drinking, environmental, and process water. Tests such as Colilert, Enterolert, and Pseudalert are widely used to identify the presence of coliforms, E. coli, enterococci, and Pseudomonas aeruginosa, providing rapid and reliable results for regulatory compliance and safety monitoring. Ideal for laboratories, utilities, and environmental monitoring teams, specific water testing solutions offer a dependable way to assess microbial water quality and support ongoing compliance with international safety standards.
  • Legionella Testing

Active filters

Flexible thermoreactor for sample preparation of photometrical determination of COD, total chrome, total phosphate, total nitrogen and TOC. Digestion is possible with three temperature ranges and three pre-programmed reaction times.

  • Three Temperature Ranges
  • The reactor can operate optionally with 100°C, 120°C or 150°C – depending in each case on the sample to be prepared.
  • Three Different Reaction Times
  • Three different reaction times are available with 30, 60 and 120 minutes. Your advantage: Afterwards the unit switched itself off automatically.
  • Large Cuvette Shaft
  • Place up to 24 16-mm-round cuvettes in the RD 125.
  • Voltage Change Possible
  • The RD 125 can be used with various voltages: Choose 110 V and 220 V with the voltage selector on the back.

Hydrosense PRO Ultra Legionella Swab Test

£74.06 vat excl.

£88.87 vat Inc.

Availability: Out of stock

Our comprehensive and sensitive Legionella swab test is designed for testing surfaces and biofilm. The process involves collecting a sample through swabbing areas where biofilm accumulates e.g. shower heads, taps, storage tanks, pipework and the water edge of pools or hot tubs.

Biofilm is the common habitat for Legionella pneumophila. This slimy substance protects this bacterium from heat or chemical treatments.

This method is highly recommended for evaluating surfaces in environments such as cooling towers, water tanks, sinks, showers, hot tubs, misters, sprinklers, air washers, and humidifiers, among others.

Hydrosense PRO Ultra Legionella Water Test

£79.23 vat excl.

£95.08 vat Inc.

Availability: Out of stock

Our comprehensive and sensitive Legionella testing solution is designed for water safety. This advanced one-time-use kit uniquely detects all serogroups (1-15) of the most dangerous Legionella species, Legionella pneumophila in just 25 minutes.

Easy-to-use test; it can be carried out by anyone in any setting and requires minimal training. Our visual instructions provide a simple step by step guide.

Ideal for cooling towers, water storage units, decorative fountains, taps, showers, spas, swimming facilities, and more, this solution offers exceptional coverage and reliability. Its unparalleled sensitivity and comprehensive detection capabilities make it the preferred choice for high-risk areas, ensuring the highest level of Legionella detection.

Standard Bluetooth Legionella Thermometer Kit

£198.00 vat excl.

£237.60 vat Inc.

Availability: Out of stock
  • Standard Bluetooth® enabled water thermometer kit
  • Paperless legionella risk assessments
  • Free software, no ongoing costs
  • SDK and technical support available
  • Thermocouple type K thermometer
  • Penetration and wire probes
  • Free zip pouch
  • Take accurate, time-stamped temperatures for Legionella risk assessments with this standard Bluetooth-enabled thermometer kit. Two probes included for different checks.

Premium Bluetooth Legionella Thermometer Kit

£289.00 vat excl.

£346.80 vat Inc.

Availability: Out of stock

Premium Bluetooth® enabled water thermometer kit

  • Paperless legionella risk assessments
  • Free software, no ongoing costs
  • SDK and technical support available
  • Thermocouple type K thermometer
  • Penetration, surface and wire probes
  • Timer and wipes
  • Free carrying case included
  • Take accurate, time-stamped temperatures for Legionella risk assessments with this premium Bluetooth-enabled thermometer kit. Three probes included for measuring taps, pipes and tanks.

Hydrosense PRO Ultra Legionella Industrial Kit

£301.66 vat excl.

£361.99 vat Inc.

Availability: Out of stock

Our Legionella Industrial testing kit is perfectly designed for water outlets needing repeat testing and includes everything needed to complete 5 tests. It uses our exclusive Hydrosense filter technology, enabling the isolation of bacteria through conventional plumbing connections (compatible with US ½ inch NPT and ¾ inch BPT fittings). The pipe fitting also conveniently connects directly to standard shower hoses.

Ideal for use in higher risk areas with water sample points that require frequent monitoring, including industrial cooling systems, extensive water networks within hotels, healthcare facilities, residential buildings, and commercial premises.

This is an advanced portable photometer for the measurement of pH parameters in water. This meter offers a superior optical system that utilises a reference detector and narrow band interference filters for extremely fast and repeatable measurements. The photometer has an innovative optical system that offers superior performance in accuracy, repeatability and the short amount of time it takes to perform a measurement. This compact, waterproof meter is extremely user friendly with a tutorial mode that walks the user graphically, step by step, in performing a measurement. The use of a backlit dot matrix LED allows the use of virtual keys which makes the operation of the meter very intuitive including selecting different methods, reviewing GLP data, recalling the last 50 measurements, and customising the meter to user preferences.

  • Each photometer is delivered in a cardboard box and is supplied with:

ProfiLine pH3110

£635.00 vat excl.

£762.00 vat Inc.

Availability: 9 In Stock

For testing of waste water.

  • Easy-to-operate, robust pH/mV-meter with large LCD-display, for mobile routine measurement.
  • Meter in carry case with
  • pH-sensor SenTix™ 41
  • buffer solution STP 4 and STP 7
  • stand, beaker
  • short instruction manual
  • CD-ROM and batteries
  • Handy case sets for field applications
  • The ProfiLine handhelds are available as single instruments in a case without measurement accessories, but also as sets supporting individual application requirements.
  • The case also serves as a small field laboratory.

Humimeter RH2 Water Activity Meter/Analyser Kit

£2,096.43 vat excl.

£2,515.72 vat Inc.

Availability: Out of stock
  • Easy to use
  • Optimal documentation of your quality
  • Long stable humidity sensor
  • Easy data storage at the portable moisture meter
  • Analysis on PC and printer available
  • Automatic datalog for up to 10,000 logs with measuring point report
  • Online-function, Hold function, manual data memory
  • Relative humidity, absolute humidity, dew point, equilibrium moisture content, aw value

PAWKIT Portable Water Activity Meter

£2,300.00 vat excl.

£2,760.00 vat Inc.

Availability: 48 In Stock
  • Completely portable
  • Pocket-sized about 4 x 3 x 1 inch
  • Lightweight (4 ounces)
  • Runs for about 3 years on 2 button cell batteries
  • Easy two-point calibration
  • Uses regular AQUALAB cups and standards

pHotoFlex 'Multi' Colorimeter

£3,060.00 vat excl.

£3,672.00 vat Inc.

Availability: 10 In Stock
  • More than 150 programs for routine analysis
  • Test kits for every demand: from high precisely to easy, fast and economic
  • Storage with Identification Number (ID)
  • Data filter for easy selection of data sets
  • Electrochemical pH-measurement from pH 0–16.00 (± 0.01) for Standard DIN pH-electrodes
  • Automatic Temperature Compensation (ATC)
  • Redox Measurement
  • 1-3 point calibration with calibration interval setting and calibration protocol
  • IR light source acc. to DIN 27027/ISO 7027
  • Turbidity measurement range from 0.01-1100 NTU/FNU providing drinking water accuracy
  • Longterm stable AMCO Clear Standards with ±1% manufacturing accuracy
  • The most versatile colorimeter for field and lab
  • Fast readings in 5 minutes or less
  • Accurate to ±0.003 aw
  • Verifiable with independent salt standards
  • Easy to use - precise measurements with minimal training
  • Portable design weighs just 3kg (7lbs)
  • Secure administrative control over calibration and sample data
  • Used by 80 of the top 100 food companies