Device for measuring concentration of gases

The invention concerns a device 1) for measuring concentration of gases, particularly trace gases, comprising, within an housing (2) having such reduced dimensions to allow its introduction within a well or a piezometer, very small sized concentration meters, or sensors, for different types of gaseous chemical species and weather parameters, a real time calibration system, after every acquisition, of the different sensors to take into consideration the variations of all the environmental parameters, and a GPS system allowing synchronizing measurements carried out by other measurement devices such as, for example, accelerometers and seismographs.