  We calculate the tunneling conductance spectra of a normal metal / insulator
/ triplet superconductor from the reflection amplitudes using the
Blonder-Tinkham-Klapwijk (BTK) formula. For the triplet superconductor we
assume one special p-wave order parameter having line nodes and two two
dimensional $f$-wave order parameters with line nodes breaking the
time-reversal symmetry. Also we examine nodeless pairing potentials. The
tunneling peaks are due to the formation of bound states for each surface
orientation at discrete quasiparticles trajectory angles. The tunneling spectra
can be used to distinguish the possible candidate pairing states of the
superconductor Sr$_2$RuO$_4$.
