G.Re.T.A. is the most effective and innovative solution for Permanent Geoelectric Monitoring of the conditions of large sections of soil. This instrument measures the alteration over time of the soil’s resistivity profile, functional to the characterization of the same in terms of water content, presence of cavities or other anomalies.

Multielectrode Electric Tomography (ERT) is based on the insertion of an electric field in the ground through electrodes (input electrodes), and the measurement of the voltage is effectuated through other electrodes (measurement electrodes). From the measure of the voltage it is possible to obtain, through the second law of Ohm, the resistivity value, a peculiar characteristic of all materials.

 Max number of electrodes  48 
 Distance between the electrodes  1 - 3 m 
 Measured profile lenght 47 - 142
 Max measured profile depth up to 22 m
 Electrodes For horizontal installation: one wing plate or picket
 For vertical installation: three wings plate
 Measurement configuration Wenner
 Power supply Solar panel
 Transmission Modem / router for automatic data
 Control and configuration Remote via LSI LASTEM Cloud
 Alarm management Based on pre-defined thresholds

Code: GRT001
One wong plate
3 wings plate


G.Re.T.A. – Geo REsistivimeter for Time-lapse Analysis is the new Geo-resistivimeter for fixed installations


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Public awareness of tailings dams failures is increasing, as several serious incidents have occurred in recent years, resulting in extensive environmental damages and human causalities. G.Re.T.A. a new break-through monitoring technology may be the definitive answer.