- DynOptic Systems Ltd
 - Design, manufacture, and supply continuous emmission particulate and opacity monitors for incinerators, furnaces, boilers, crematoria, bag-houses, and filtration units. - Gas Measurement Instruments Ltd.
- Designs and manufactures a wide range of gas detection equipment.
- Safe Training Systems
- Specialises in the design and manufacture of instruments for detecting contamination.
- Siemens Environmental Systems Limited
- Offers personal, local, and wide area radiation monitoring systems, toxicity and pollutant monitoring for waste water and drinking water, and more.
- Van Walt Ltd
- Supplies augers and related equipment for groundwater sampling, soil and earth testing, sludge and sediment sampling, penetrometers, and permeameters.
- Weiss Gallenkamp
- Manufacturer of environmental test equipment and temperature chambers, and climatic, humidity, stress, and pharmaceutical testing and plant growth chambers.
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