FIELD: construction of roads, side-walks, platforms, floors, embankments and other structures both with hard pavement and without it, operational test of ground consolidation during layer by layer compaction of it. SUBSTANCE: for increased precision of measurements and simplification of process of operational test of ground density sensor of movement of striker is manufactured in the form of make contact controlled magnetically which magnet is anchored on rod with spring in trigger mechanism that interacts with gripper fitted with spring. Unit processing measurement results is supplemented with transmitter, receiver and switch with matching unit. The transmitter is made in the form of modulator which output is connected through supply key to first input of carrier frequency amplifier and to input of carrier frequency generator which output is connected to second input of carrier frequency amplifier. Output of amplifier is connected to transmitting antenna anchored in upper part of case. Make contact controlled magnetically is connected to input of modulator and counter with one end and to power supply source with the other end. Receiver is made in the form of receiving antenna, input circuit, high-frequency amplifier, frequency converter, amplifier, detector, low-frequency amplifier, filter and modulation frequency amplifier which output is linked through matching unit to switch connected in series. EFFECT: increased measurement precision and simplified measurement process. 3 dwg
