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  • The deepest can reach 100-150 meters


  • The internal structure and design of GD-10 and GD-20 are different, so GD-10 cannot be upgraded to GD-20.


  • GD-10 is a single-channel system. GD-20 has 5 channels and 12 channels. It is a multi-channel system. Under the same conditions, if the wenner device is used, the collection efficiency of GD-20 will be much higher than that of GD-10.



  • The double-tap current is large, so ip test can be done to get more accurate data.


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