Low Frequency Geophone 4.5Hz(ST-4.5N) is a long coil travel version geophone, which is equivalent to SM-6 B coil 4.5hz geophone. The extra coil travel offers an advantage for higher tilt requirements and where larger amplitude signals may be encountered, for example, in industrial vibration monitoring. The low frequency geophone 4.5Hz can be supplied for vertial … Continue reading Low Frequency Geophone 4.5Hz with Reinforced Land Case