A gas chromatography multi-detector (GC-MD) trace gas analyser that uses electron capture detection (GC-ECD) to make measurements of N2O and SF6 and a reduction gas analyser (GC-RGA) to make measurements of CO and H2. This instrument uses an Agilent 6890N GC (serial number: US10335065) equipped with a micro-ECD and a Peak Performer 1 - see Stanley et al. (2018) for more instrument details: https://doi.org/10.5194/amt-11-1437-2018