Yeah, $120 is pretty steep for a box that only tests. Of course, the P-D surge protector/analyzer is a lot more than that too. Bu *** provides ongoing protection and problem detection, where as this tester is a one-time thing. Probelms, if they occur, may not begin until sometime after you hook up - maybe even days later.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL