... component geophone, tri-component geophone and inner-well geophone.CDJ low-frequency geophones, 1Hz, 2Hz, 2.5Hz or 3Hz, are widely ... in engineering, surface wave survey and low frequency measurement in other fields.CDJ middle & high frequency geophones, 4,10,15,28,30 ... CDJ-Z1CDJ-P1CDJ-S1CDJ-Z2CCDJ-P2CCDJ-S2C VerticalHorizontal3-CVerticalHorizontal3-CNature Frequency Fn (Hz)1±10%2±10%Sensitivity in Open ...