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The Computer Controlled Nozzle Performance Test Unit, "TFTC", has been specially designed to allow students to investigate and study the performance of a nozzle (kinetic energy and thrust). Operating from a normal laboratory compressed air supply, the unit is supplied with one convergent and four convergent-divergent nozzles that can be rapidly interchanged. This test unit consists of a pressure chamber, with two supports for the nozzles, and a force sensor in its bottom support. Depending on how the user wishes to work, the nozzle will be fixed to the bottom or to the top support. On the side in which the nozzle has not been fixed, the user will put the lid on which the air will fall. This lid makes a system that allows the air to be separated from it as soon as the air has impacted tangentially on the incidence direction, not on the anti-paralell direction to the incidence direction. Thus, the measured force will be only the incident one, without any kind of reaction due to the "rebound" of the jet. By means of a valves system the user will be able to obtain that the air comes into the chamber in its bottom or in its top part. Besides, the pressure in the chamber will be contr