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• Oakton Instruments[No URL available; Tel: (888) 462-5866]

• Ocean Optics, Inc.

• OFC Corporation

• O'Hara Technologies, Inc.[No URL available; Tel: (800) 206-6545]

• Ohaus Corporation

• Ohmart/VEGA

• OL Analytical

• OLIS, Inc.

• Olympus America Inc.

• Omega Optical

• Omnifit Ltd.

• Omni International, Inc.
  
  
• Ontario Ovens, Inc.
  
  

• Optical Solutions, Inc.
  
  

• Optical Technology Devices, Inc.

• Optics For Research, Inc.

• Optim Electronics

• Optronic Laboratories, Inc.[No URL available; Tel: (800) 899-3171]

• Optronics

• Orbeco Analytical Systems, Inc.

• Organomation Associates, Inc.[No URL available; Tel: (888) 838-7300]

• ORION Fittings

• Orion Research, Inc.

• Osmic, Inc.

• Osmonics, Inc.

• Ooven Industries, Inc.

• Oxford Molecular Group

• Oxford Molecular Group

• Oxford Instruments, Industrial Analysis

• Oyster Bay Pump Works, Inc.

• Ozone Solutions