Techniques are described for measuring or quantifying the logging behavior in the source code of a computer program. The apparatus comprises an interactant that is configured to interact with the analyte in breath to generate a change in thermal energy relative to a base thermal energy. If there are at least two MCnon-conductive tubulars and at least three conductive tubulars, two of the MCnon-conductive tubulars may be alternately disposed between three of the conductive tubulars.