This report describes the performance of the CDF Plug Upgrade
calorimeter measured at the Fermilab Meson Beam line.  A 60^o section of the
Electromagnetic and Hadronic calorimeters has been exposed to e^+, pi^+ and
mu^+ beams.  We determine an every resolutions of sigma(E)/E = 15.5%/sqrt E
for the Electromagnetic and sigma(E)/E = 78%/sqrt E \oplus 5.3% for the
Hadronic Calorimeters (E measured in GeV).  The linearity of transverse
response is 1.6% for e^+ and 2.3% for pi^+.  The Shower Maximum Detector,
instrumenting the EM calorimeter, provides a position resolution of 1 mm for
e^+ energies above 50 GeV.  The detector calibration system, based on a set of
movable Cs^137 sources, is able to track the energy scale at the level of \sim
1 - 2 %.