KATRIN (Karlsruhe Tritium Neutrino Experiment) is an experiment to measure the mass of the electron neutrino with sub-eV precision by examining the spectrum of electrons emitted from the beta decay of tritium. As of 2006, the apparatus is under construction in Karlsruhe, Germany, and is expected to begin collecting data in 2009.[1] The core of the apparatus is a 200 ton spectrometer, which has been built by MAN DWE GmbH in Deggendorf and was shipped to Karlsruhe via a 8600 km route involving the Black Sea, the Mediterranean Sea, the Atlantic Ocean and the Rhine.[2]