| a1-cbiss | F1 | AQE |
| ABB Measurement & Analytics | D13 & D14 | AQE |
| ABB Measurement & Analytics | Q2 & R2 | WWEM |
| Air Liquide UK | C4 | AQE |
| Air Monitors | B3 & C3 | AQE |
| Air Products | H4 | AQE |
| Alphasense | I16 | WWEM |
| Analytical Technology | G7,G8,H6,I7 | WWEM |
| Anatune | R3 | WWEM |
| AP Technologies | H2 | AQE |
| Aquamatic | K1 & K2 | WWEM |
| Aquaread | J10 & J11 | WWEM |
| Ashtead Technology | G3 | AQE |
| Beka Associates | P1 | WWEM |
| Blackline Safety Europe | V7 | WWEM |
| Bühler Technologies | E9 | AQE |
| Burkert Fluid Control Systems | V6 | WWEM |
| CEM | E8 | AQE |
| Chelsea Technologies | Q7 | WWEM |
| Codel International | E4 & F4 | AQE |
| CoGDEM | A8 & A9 | AQE |
| Cogent Skills | Q5 | WWEM |
| CSA Group | I12 | WWEM |
| Detectronic | Q8 | WWEM |
| Draeger | S1 | WWEM |
| Durag Holding | E3 & F3 | AQE |
| DynOptic Systems | B4 | AQE |
| Earthsense | D2 | AQE |
| ECH Elektrochemie Halle | U2 | WWEM |
| Element | D1 | AQE |
| Endress and Hauser (UK) | M4 & N5 | WWEM |
| Enotec | B11 | AQE |
| Envea UK | F1 | AQE |
| Enviro Technology Services | E2 & F2 | AQE |
| Environmental Monitoring Solutions | F6 & G6 | AQE |
| Envirosoft | C1 | AQE |
| Envitech Europe | A2 | AQE |
| Eurotron Instruments | C5 | AQE |
| EXOR | P6 | WWEM |
| Flexim Instruments UK | O9 | WWEM |
| Flowquip | P8 | WWEM |
| Fuel Cell systems | J7 | WWEM |
| Gasmet Technologies (UK) | B8 & C6 | AQE |
| George Fischer | N6 | WWEM |
| Grant Instruments | M3 | WWEM |
| Hach | J4 | WWEM |
| Hiden Analytical | R1 | WWEM |
| HMS Industrial Networks | K10 | WWEM |
| Horiba | I5 | WWEM |
| Horiba | I6 | AQE |
| HWM-Water | S2 | WWEM |
| ifm electronic | J13 & J14 | WWEM |
| In-Situ | I13 & I14 | WWEM |
| Infratec | H3 | AQE |
| International Environmental Technology Publications | A10 & A11 | AQE |
| International Labmate | A10 & A11 | AQE |
| ITS Europe | K5 | WWEM |
| JSB UK & Ireland | J12 | WWEM |
| Katronic Technologies | M1 | WWEM |
| KELLER | S3 | WWEM |
| Kisters | I3 & J3 | WWEM |
| Kisters | I3 & J3 | AQE |
| KNF Neuberger (UK) | F5 | AQE |
| Kobold Instruments | P7 | WWEM |
| Kuntze Instruments | R4 | WWEM |
| Langham Industrial Controls | I11 | WWEM |
| Leading Edge Power | L9 | WWEM |
| Linkwave Technologies | S6 | WWEM |
| M&C Techgroup | D5 | AQE |
| Merck | L3 | WWEM |
| 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 |
| Orbital | D4 | AQE |
| Palintest | P13 | WWEM |
| Partech Instruments | K9 & L7 | WWEM |
| Photonic Measurements | R8 | WWEM |
| Process Measurement & Analysis | L5 & M5 | WWEM |
| Protea | B1 | AQE |
| Pulsar Process Measurement | O10 & P12 | WWEM |
| Rivertrace Engineering | R10 | WWEM |
| Rockall Safety | O3 | WWEM |
| Rose Plastic UK | K7 | WWEM |
| Rostech Environmental | R5 | WWEM |
| Rotorflush Filters | T3 | WWEM |
| RS Hydro | O7 & P9 | WWEM |
| Scielutions | D8 | AQE |
| Shimadzu UK | J5 | WWEM |
| SICK (UK) | D6 & E6 | AQE |
| Signal Group | D11 | AQE |
| Siris Environmental | I9 | WWEM |
| Skalar UK Ltd | P14 & Q13 | WWEM |
| SOCOTEC UK | D7 | AQE |
| STA | A8 & A9 | AQE |
| Swan Analytical Instruments UK | T6 & U4 | WWEM |
| TE Laboratories | O2 | WWEM |
| Technolog | I8 & J6 | WWEM |
| Trihedral | K6 | WWEM |
| Trolex | E11 | AQE |
| TSI Instruments | G4 | AQE |
| Turnkey Instruments | E13,E14,E15,E16 | AQE |
| Uniper Technologies | C9 | AQE |
| Valmet | R7 | WWEM |
| Vega Controls | K8 & L6 | WWEM |
| Verulam Scientific | P2 | WWEM |
| WeCare4Air | G1 & H1 | AQE |
| Wireless Innovation | R11 | WWEM |
| Xylem | H8, I17 & J15 | WWEM |
