Main applications:
VLF electromagnetic prospector applies electromagnetic wave transmitted by very-low frequency radio station as field source, to measure the many parameters change influenced by various geological bodies.
ADS-3 VLF (very low radio frequency) electromagnetic prospector is applied to explore underground minerals and caves, fast resistivity mapping; it also has a good effect to explore underground tubes, substructures and leaking dams.

advantages: 

1:Measuring parameters: magnetic field horizontal and vertical components, polarized ellipse inclination and ground electric field horizontal components.
2:The attenuation of electromagnetic waves transmitted by VLF broadcasting station is small; the field intensity is even, low noise and long working time. It can be used in anywhere.
3:Simple operation, stable and reliable, multiple applications, and flexible usages.
Small volume and light weight.

Main specifications:
Working frequency: 17.4 KHz and 22.3 KHz.
Measuring parameters: magnetic field 1mγ~30mγ
Inclination angle: ±45°
Electric field: 3μV/m~200μV/m
Short-circuit noise: less than 1μV 
Using environment temperature: 0℃~40 ℃
Relative moisture: 85%
Power supply: 9V, Power consumption: less than 120mW 
Dimensions: 260*95*150 mm
Weight: 3.5 kg (including electrodes and cables)