... . CDJ middle & high frequency geophones, 4,10,15,28,30,40,60,80 or 100Hz, are widely used to seismic prospecting ... /HoriVerti/HoriVerti/HoriNature Frequency Fn (Hz)30±5%38±5%40±5%60±5%100±5%Sensitivity G (v/cm/s ... Mass M (g)8.67.97.95.95.2Operating Temperature (°C)-40~+70Coil diameter (mm)Ø27.2Coil Height (mm)3434343232Coil Weight (mm ...