Gas - Testing - Medical in Middlesbrough, Cleveland
| Name & Address | Phone # | Website |
| O I S Huntsman Drive, Middlesbrough, Cleveland TS2 1TT | 01642 731498 |  |
| O I S (Teeside) PO Box 1949, Middlesbrough, Cleveland TS90 8JG | 01642 770800 |  |
| Ridsdale & Co Ltd Newham Hall, Middlesbrough, Cleveland TS8 9EA | 01642 300500 | |
| Tees Valley Measurement Cannon Street, Middlesbrough, Cleveland TS1 5JJ | 01642 223535 | |
