Abstract: A device for analyzing at least one parameter of a chemical or biochemical or biological reaction in a reaction container, the analysis device includes an arm intended to be fastened by means of a sliding link against a face of a wall of the reaction container by means of a static end, the arm having a degree of freedom in translation in relation to the wall, a sensor designed to measure the at least one parameter, the sensor being fastened to a free end of the arm, a drive device designed to cause an axial displacement of the arm along the degree of freedom, a hermetic isolating device for isolating the arm from the reaction, the hermetic isolating device joining the arm to the face of the wall.