Calibration
We calibrate flue gas analysers from Anton, Testo and more (price list).
Accredited Service Centre
We are an authorised repair centre for Anton, TPI, Testo and more.
Collection
We can collect from your premises if you are local to us.
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Contact Us
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Address
GES Ltd (PASS Ltd)
Unit 1 & 3 Little Ridge Ind. Estate
Welwyn Garden City
Hertfordshire
AL7 2BH
Directions >
Opening Times
Mon – Thu: 07:30 – 17:30
Fri: 07:30 – 16:30
Sat – Sun: Closed
Located just off the A1 and M25, our Hertforshire service centre is ideally situated for those in and around the city centre and North London. We also operate free UK collection services** to Stevenage, Luton, Watford, Harlow, Welwyn City Garden, and more.
Free weekly Collection & Return using our own fully insured vehicles
Check to see if we cover your postcode
Non-residential addresses only. View our price list
How it Works
Collection & Return
We will arrange a pick-up and drop-off at a convenient time for you.
Drop-off Point & Return
Use a UPS Drop-off Point and we’ll return items to your supplied address via courier.
Return Only
Arrange your own courier collection and we will return your items via courier.
Trade Counter
At Leeds, we can offer a same day service for an additional 25% fee.
About Hertfordshire Service Centre
PASS Ltd acquired Gas and Environmental Services in 2024. Established in Hertfordshire since 1995, we specialise in servicing, calibrating, and repairing gas testing equipment. Our purpose-built service centre and team of experts, with nearly 40 years of industry experience, enable us to provide our services and expertise to customers worldwide. Our client base spans from sole traders and service centres to national companies and even utility companies.
We are an authorised service centre for Anton, Telegan, Crowcon, GMI, Testo, TPI, and many other leading brands. Committed to safety within the gas industry, we continually develop our services to meet the demands of evolving legislation.
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More Accreditations
ISO 9001:2015
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