| Air Liquide UK | C4 | AQE |
| Air Monitors | B3 & C3 | AQE |
| Alphasense | I16 | WWEM |
| Anatune | R3 | WWEM |
| Aquaread | J10 & J11 | WWEM |
| Beka Associates | P1 | WWEM |
| Blackline Safety Europe | V7 | WWEM |
| CEM | E8 | AQE |
| Chelsea Technologies | Q7 | WWEM |
| Codel International | E4 & F4 | AQE |
| Detectronic | Q8 | WWEM |
| DynOptic Systems | G5 | AQE |
| Earthsense | D2 | AQE |
| Enviro Technology Services | E2 & F2 | AQE |
| Envirosoft | C1 | AQE |
| EXOR | P6 | WWEM |
| Flexim Instruments UK | O9 | WWEM |
| Flowquip | P8 | WWEM |
| Fuel Cell systems | J7 | WWEM |
| Gasmet Technologies (UK) | B8 & C6 | AQE |
| Grant Instruments | M3 | WWEM |
| HMS Industrial Networks | K10 | WWEM |
| HWM-Water | S2 | WWEM |
| ifm electronic | J13 & J14 | WWEM |
| In-Situ | I13 & I14 | WWEM |
| Infratec | H3 | AQE |
| International Environmental Technology | T8 | WWEM |
| International Labmate | Q2 | WWEM |
| ITS Europe | K5 | WWEM |
| KELLER | S3 | WWEM |
| Kobold Instruments | P7 | WWEM |
| Kuntze Instruments | R4 | WWEM |
| Linkwave Technologies | S6 | WWEM |
| M&C Techgroup | D5 | AQE |
| Metasphere | J8 & J9 | WWEM |
| Meteor Communications | Q11 | WWEM |
| Metrohm UK | O8 | WWEM |
| mirsense | A4 | AQE |
| National Physical Laboratory | D15 & D16 | AQE |
| Nivus UK | M6 & N7 | WWEM |
| Partech Instruments | I8 & J6 | WWEM |
| Photonic Measurements | R8 | WWEM |
| Process Measurement & Analysis | L5 | WWEM |
| Protea | B1 | AQE |
| Pulsar Instruments | O10 & P12 | WWEM |
| Rose Plastic UK | K7 | WWEM |
| Rostech Environmental | R5 | WWEM |
| Rotorflush Filters | T3 | WWEM |
| RS Hydro | O7 & P9 | WWEM |
| Scielutions | D8 | AQE |
| SICK (UK) | D6 & E6 | AQE |
| Skalar UK Ltd | P14 & Q13 | WWEM |
| SOCOTEC UK | D7 | AQE |
| STA | A11 | AQE |
| Technolog | K9 & L7 | WWEM |
| Trihedral | K6 | WWEM |
| Turnkey Instruments | E13,E14,E15,E16 | AQE |
| Uniper Technologies | C9 | AQE |
| Valmet | R7 | WWEM |
| Vega Controls | K8 & L6 | WWEM |
| WeCare4Air | G1 & H1 | AQE |
| Xylem | H8, I17 & J15 | WWEM |
