GD-C Portable Ungerground Water Detector Application: Metal and non-metal ore survey Decrease mineral invest venture and increase exploration success rate Underground water detect Meet demand of drinking water, industrial usage and agricultural irrigation. Engineering geological prospect and disaster geological detect Coal goaf, archaeological mining, city exploration and non-metal pipe survey Main features: Fast and high efficiency Easy to carry Easy operation Good precision and high accuracy Very practical and low cost Flexible array—traditional and unique array method Technical parameters: 1. It can store 20 curves’ measuring data of "Two-pole profile", "Two-pole sounding" and “Annual profile” measurement. 2. Data and abnormal curves can be introduced by a 4G U-disk storage to computer with the USB port, which is very convenient for data analysis. 3. Power supply: by 4 dry batteries or 4 rechargeable batteries. 4. Measuring range: 0.001mV~2550mV (auto range transfer) 5. Resolution: 0.001mV 6. Measuring accuracy: ±2% ±3 LSB 7. Input impendence: ≥10MΩ 8. Working temperature: -10°C~+50°C 9. Working humidity: 95% Whole weight.1.5kg, size: 24cm*13cm*16cm.