We performed photometric calibration of the PhotoMultiplier Tube (PMT) and
readout electronics used for the new fluorescence detectors of the Telescope
Array (TA) experiment using Rayleigh scattered photons from a pulsed nitrogen
laser beam. The experimental setup, measurement procedure, and results of
calibration are described. The total systematic uncertainty of the calibration
is estimated to be 7.2%. An additional uncertainty of 3.7% is introduced by the
transport of the calibrated PMTs from the laboratory to the TA experimental
site.Comment: 43 pages, 15 figure