A borescope device having an insertion tube, a camera head assembly, and a fluid supply system. The electrode is designed to allow \u201cone-point\u201d in vivo calibration, i. The receiving node retrieves ri and hi from packet i; retrieves a code sequence associated with a previous packet j, in one embodiment, comprising the last 5 bits of a hash value of a previous packet j, generates a hash value based on the random number ri and the code sequence ; and declares a replay attack if hi does not equal hj+1. The compression sleeve assembly also includes a conduit and a compression module that is operable to inflate the sleeve through the conduit.