Single Seismic Geophone with KCK Screw Fit Male Connector, with Vertical Direction and Horizontal Direction optional. Follwing Geophone Types are available: 

Single Seismic Geophone 1Hz 

Single Seismic Geophone 2Hz 

Single Seismic Geophone 2.5Hz 

Single Seismic Geophone 3Hz 

Single Seismic Geophone 4Hz 

Single Seismic Geophone 4.5Hz 

Single Seismic Geophone 8Hz 

Single Seismic Geophone 10Hz 

Single Seismic Geophone 14Hz 

Single Seismic Geophone 15Hz

 Single Seismic Geophone 28Hz 

Single Seismic Geophone 30Hz 

Single Seismic Geophone 38Hz

 Single Seismic Geophone 40Hz

 Single Seismic Geophone 60Hz 

Single Seismic Geophone 80Hz

Single Seismic Geophone 100Hz

All the geophones are equipped in Land Case with Steel Soil Spike and 1Meter Leader Cable and Terminated with KCK Male Screw Fit Connector.
Data Sheet for 40Hz Geophone:
Natural Frequency ( Hz ):40 ± 5.0%
Coil Resistance (Ω):540 ± 5.0%
Open Circuit Damping:0.620 ± 5.0%
Damping With Shunt Resistor:0.648 ± 5.0%
Open Circuit Intrinsic Voltage Sensitivity ( v/m/s ):32.5 v/m/s ± 5.0%
Sensitivity With Shunt Resistor:30.3 v/m/s ± 5.0%
Damping Calibration-Shunt Resistance(Ω):7500
Harmonic Distortion(%):＜0.20%
Typical spurious frequency ( Hz ):≥300Hz
Moving Mass ( g ):9.3g
Typical Case To Coil Motion p-p ( mm ):1.8mm
Operating Temperature Range ( ℃ ):-40℃ TO +100℃