Resistivity (geo-electrical) surveying is one of the most versatile and successful geophysical prospecting methods for mineral prospecting, ground resistance measurements, geological and geo-technical mapping, bedrock studies, certain civil engineering applications and also for ground water prospecting. The Aquameter's intelligent microprocessor technology employs ingenious methods for extracting subsurface information. It is a popular instrument, because of its single button operation, deep penetration, accurate and reliable results, even in adverse field conditions. The instrument has a facility to measure self potential (SP) which is useful in mineral prospecting and environmental studies. Aquameter CRM - 20 : Low power version (4W) suitable for high resistivity soil. Aquameter CRM 500 : High power version (40 W) suitable for saline & marshy terrain. Aquameter CRM AT : It is in it's final stages of development. Essentially it is a more advanced version of CRM 500. Key Features Data Storage - upto 1000 readings Alpha Numeric Display Computer interface - RS 232, Serial Automatic setting of earth current Displays apparent resistivity along with the apparent resistance for Wenner and Schlumberger configuration. Numeric and Function keys. Applications of Earth Resistivity Meter Ground Water Exploration Bed Rock Studies Mining Civil Engineering Environmental studies Geological and geo-technical mapping Agriculture engineering Pipe line surveys A complete information of the instrument, it's field operation and guidelines about interpretation of the data are provided. A full guarantee for a period of 1 year against any manufacturing defects is given on all products.