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This tender seeks offers for gas analyzers measuring d13C isotope in CH4 and CO2 for continuous measurements (24/7). Analyzers should be portable in a way that those can be applied on field conditions with electricity supply and with warm cabin. The equipment will be applied for GHG measurements on various ecosystems, like drained forested peatlands and drained agricultural soils. Therefore, we look for equipment’s of high precision in order to quantify variation of d13C with small sinks and small sources of CH4.