The purpose of this study is to suggest a measuring technique of plasma jet temperature and velocity using an relatively economic apparatus. Argon gas was used as a plasma source. Temperature and velocity of the plasma discharged into air through the anode nozzle was measured. Plasma temperature was obtained by measuring enthalpy which was transferred from plasma to water in a water-cooled probe. The plasma velocity was obtained by measuring the dynamic pressure of the plasma by using the same water-cooled probe. Axial and radial distributions of temperature and velocity were also obtained. The validity of the measured enthalpy and velocity profiles has been confirmed by performing mass and energy balances, which show reasonable agreements between the quantities used and those obtained by integrating over the experimental data.