- For sale complete RS4D board with geophone. The board was under water and it is not working now. For sale is complete board with geophone (4.5 Hz 395 Ohm vertical Racotech RGI-20DX geophone with electronic extension to lower frequencies (<1 Hz)). Or just geophone. The price is 100e and my shipment.
- Vertical geophone 1.0 Hz Vertical 3.510 -6 mm/s/count or 0.1310-6 inch/s/count 100e and my shipment
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