Vibration probe length?

Can you tell me the cable length for PR55-61E? I need about 12-15’, if it is not this long is there an extender or can I order a longer one? Can I order a standard spare?

About my intended application: To attach the probe to an underground steel sewer pipe magnetically, and then permanently bury the probe but allow for access on the surface. This pipe is evidently carrying vibration from the local municipal plant and it is carrying through the soil into homes, with frequencies at 58 Hz and 65 Hz, but the municipality refused to acknowledge or rectify it.

the cable length is 2meter.increaseig the cable length will generate noise and degrade the signal.