Experimental results of the thermal diffusivity and of the sound velocity of Round-Robin R134a are presented for the temperature range from ambient temperature to the critical point along the saturation line. The measurement technique applied was dynamic light scattering, which works in thermodynamic equilibrium. The results of the sound velocity are compared to those calculated with different equations of state (EOS). The measured thermal diffusivity is transformed to thermal conductivity and compared to recently published data.