A tamper-evident band is provided which includes a pull tab which is more easily located and more easily grasped by a consumer for removing the tamper-evident band from a container. The present invention relates to a system for evaluating properties of a fluid flowing in a pipe. The method can include acquiring a multiplicity of mass spectra of the calibrant material during an analytical run, and in some embodiments, calculating a multiplicity of mass calibrations on the basis of mass spectra obtained from the calibrant material introduced during the analytical run. The guide device comprises guide means in order on displacing the vehicle base part to guide the test probe carrier in the travel direction up to the first reversal point after it has reached the second reversal point, and in order to lead back the test probe carrier opposite to the travel direction up to the second reversal point after it has reached the first reversal point. %, and an Fe\u2014Cu\u2014C alloy powder containing copper in an amount which is the solid solubility or larger and is 5-50 wt.