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This universal manifold can be fitted to a variety of instruments and affords the same analytical precision and accuracy of the instrument while allowing for the real time measurements. Here, we paired the manifold to a single quad MS with an electron impact (EI) source operated in scan mode to detect extracted target gases by their respective masses (e.g., 12CO2 at mass 44, 13CO2 at 45). We demonstrated applicability of the RTMS instrument to different biological ecosystems (bacterial cultures, plants, and soil), and in all cases, we we