Gas Isotope Analyzers Picarro instrumentation can measure and quantify stable isotope ratios with high precision to unravel the biochemical processes encoded in a sample. δ13C δ15N δ17O δ18O δ2H Isotopic Carbon Dioxide (iCO2) Isotopic Methane (iCH4) Isotopic Nitrous Oxide (iN2O) Isotopic Water (iH2O)