Bay Instruments provides services and products in three core areas: Manufacturer of Membrane Inlet Mass Spectrometers for high precision dissolved gas measurements Distributor of WALZ photosynthesis equipment for the USA and Canada Pfeiffer Vacuum distributor of mass spectrometers and vacuum equipment Established in 2000, Bay Instruments, LLC assists researchers in acquiring the membrane inlet mass spectrometry (MIMS) capability developed by Todd Kana and colleagues at Horn Point Laboratory of the University of Maryland. Our focus is rapid, high precision measurement of the dissolved air gases, nitrogen, oxygen and argon, for applications in aquatic denitrification and system metabolism. We also provide solutions for other applications. Bay Instruments sells complete systems and specialized inlets, and we provide application expertise and assistance.