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| Manufacturer: | URL: |
| Ohaus | http://www.ohaus.com/ |
| Omega | http://www.frsomega.com/ |
| Ophir | http://www.ophiropt.com/ |
| OPTO22 | http://www.opto22.com/ |
| Oriel Instruments | http://www.oriel.com/ |
| ORTEC | http://www.ortecinc.com/ |
| Oxford Instruments | http://www.oxinst.com/ |