Single Geophone in Horizontal Direction, terminated with Split Spring Clip or Mueller Clips ( optional). With Geophone Types available as follows: 

Single Geophone 1Hz in Horizontal Direction

Single Geophone 2Hz in Horizontal Direction

Single Geophone 2.5Hz in Horizontal Direction

Single Geophone 3Hz in Horizontall Direction

Single Geophone 4Hz in Horizontal Direction

Single Geophone 4.5Hz in Horizontal Direction

Single Geophone 8Hz in Horizontal Direction

Single Geophone 10Hz in Horizontal Direction

Single Geophone 14Hz in Horizontal  Direction 

Single Geophone 15Hz in Horizontal Direction

Single Geophone 28Hz in Horizontal Direction

Single Geophone 30Hz in Horizontal Direction

Single Geophone 38Hz in Horizontal Direction

Single Geophone 40Hz in Horizontal Direction

All the geophones are equipped in  Land Case with Steel Soil Spike and 1Meter Leader Cable and Terminated with Split Spring Clip or Mueller Clips.
 Specification for 32CT Equivalent Geophone:

Natural Frequency (Hz): 10 ± 2.5%

Coil Resistance(Ω): 395 ± 2.5%

Typical Open Circuit Damping: 0.316 ± 2.5%

Damping Calibration-Shunt resistance(Ω): 1000 Ω

Damping with Calibration-Shunt : 0.70 ± 2.5 %,

Sensitivity: 27.50 v/m/s ± 2.5%

Sensitivity with Shunt Resistance (v/m/s): 19.70 v/m/s ± 2.5%

Harmonic Distortion ( %):＜0.1%

Typical Spurious Frequency (Hz):﹥250 Hz

Moving Mass (g): 11.20 g

Max Coil Excursion p-p (mm): 2 mm

Allowable Tilt: 10o

Operating Temperature Range (℃): -45℃ To +100 ℃