Abstract: Capacitative device for measuring the moisture content of granular or powder materials, particularly materials in motion on a conveyor belt or in a pipe comprising a capacitative probe provided with at least two electrodes separated by an insulating zone and in contact with the material being examined, a support frame for the capacitative probe, and high frequency oscillator circuit associated with the electrodes in order to supply an alternating voltage of a frequency variable with the moisture content. The probe, which has a cylindrical body may be rotated by a motor and comprises cleaning scrapers mounted on the frame which cooperate with the body of the probe when the latter is rotating.

Abstract: The ultra-flat pressure plate material tester for sounding concrete, comprises two facing side plates in the form of circular segments, of which the circular edges are turned back inwards by more than 90.degree. and assembled against one another by a flexible weld. The rectilinear edges of the side plates are assembled by using a U shaped obturator. Two elements for coupling to the hydraulic circuit are provided.