>pricing for those labs was prohibitively expensive. It's good to have reference instruments like chromatographs and infrared analyzers, where I could use ref

>pricing for those labs was prohibitively expensive. It's good to have reference instruments like chromatographs and infrared analyzers, where I could use reference gases to calibrate and verify. OTOH very low-cost sensors could be ideally suited if well designed with accompanying electronics, but ultimate calibration would require the same expensive laboratory materials for reference.