Main Applications and Features By utilizing the apparent resistivity parameters, it is widely used in hydrology, environmental protection, engineering geophysical exploration, metal and non-metal mineral resources exploration. Microcomputer controlled, direct-reading resistivity, various electrode arranging mode, data protection against power-failure This instrument applies to Electrical Prospecting such as Vertical Electrical Sounding, Electrical Profiling, Charging Method and Spontaneous Potential Method, etc. on ground and in trench. Technical Specifications Maximum Power Supply Voltage: 700V Maximum Power Supply Current: 3A Voltage Measuring Range: ±3000mV ? Voltage Measurement Accuracy: ±1.5%, ±0.1 mV Current Measuring Range: 0.1mA~3000mA Current Measurement Accuracy: ±1.5%, ±0.1mA SP Compensation Range: -1000mV ~ +1000mV Instrument Input Impedance: ＞30MΩ Working Temperature: -10℃~50℃ Volume: 244×154×237mm