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The measuring principle and experimental results of the enthalpy probe techniquefor thermal plasma diagnostics are presented. Its calibration and errors are discussed. Typicalresults are presented for the system operation in an Ar/H2(5 % H2) plasma arc jet under a reactorchamber pressure of 101.3 kPa. The plasma temperature and velocity profiles are measured. Thecenter temperature and velocity are 6600 K and 850 m/s for plasma power 9 kW at axial locationof 17 mm.