Up for sale is this USED Vibra Tech Vibra Tape seismograph particle velocity analog recorder. I don't know much about this equipment or how to test to make sure it works properly. It comes with the microphone and geophone, with certifications as shown. Item looks to be in very good vintage used condition as seen in pictures.
Vibra Tech Vibra Tape Seismograph particle velocity analog recorder, Business & Industrial, Construction, Mining Equipment