  Superconductivity in the topological non-trivial Dirac semimetal PdTe$_2$ was
recently shown to be type-I. We here report measurements of the relative
magnetic penetration depth, $ \Delta \lambda$, on several single crystals using
a high precision tunnel diode oscillator technique. The temperature variation
$\Delta \lambda (T)$ follows an exponential function for $T/T_c < 0.4$,
consistent with a fully-gapped superconducting state and weak or moderately
coupling superconductivity. By fitting the data we extract a $\lambda
(0)$-value of $\sim 500$~nm. The normalized superfluid density is in good
agreement with the computed curve for a type-I superconductor with nonlocal
electrodynamics. Small steps are observed in $\Delta \lambda (T)$, which
possibly relates to a locally lower $T_c$ due to defects in the single
crystalline sample. single crystalline sample.
