A method for measuring a condition of a structure including: moving a measurement probe through a tunnel and measuring the condition of the structure with the measurement probe wherein the tunnel is in electrical potential measurement proximity to the structure.
https://app.acclaimip.com/pdf/gT_1zyRBPi9zP_WqwUE-IxhjHQlKH17YGzunHIA/US7190154B2
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