There are worldwide efforts to search for physics beyond the Standard Modelof particle physics. Precision experiments using ultracold neutrons (UCN)require very high intensities of UCN. Efficient transport of UCN from theproduction volume to the experiment is therefore of great importance. We havedeveloped a method using prestored UCN in order to quantify UCN transmission intubular guides. This method simulates the final installation at the PaulScherrer Institute's UCN source where neutrons are stored in an intermediatestorage vessel serving three experimental ports. This method allowed us toqualify UCN guides for their intended use and compare their properties.
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