The geo-resistivity meter SYSCAL R1 Plus resistivity meter is specifically designed for medium-depth exploration. It combines a power source, transmitter up to a 200W or 600V output voltage, and a 2 channels receiver in a single unit; its compactness makes it an effective tool for intensive resistivity surveys. Measurement sequences can be configured through the instrument interface or via the PC software. The measurement is fully automatic, controlled by a microprocessor: automatic self-potential correction, automatic ranging, digital stacking for signal enhancement, error display in case of procedure troubles. It can be used for civil engineering, groundwater and environmental projects, to solve problems such as depth-to-bedrock determination, localization of weathered bedrock, clay-gravel determination, measurement of depth and thickness of aquifers, salinity control, pollution monitoring, etc. This versatile device is designed to work in a large number of configurations (SP measurements, sounding, profiling, 2D, roll-along, 3D and 3D monitoring surveys, etc.). The well-known reliability and accuracy of the Syscal range of resistivity meters will also mean extra value for both the contractor and the results end-user.