Chris, there are two companies in North Jersey that totally rely on the camera, and not much else. One of them purports to Just inspect the flue. The other is supposedly the Guardian of the chimney. No ladders on their fancy SUVs. At today's inspection I asked the chimney inspection guy if the flue looked like there had been oil heat used at one time. He said No, but it looked like there was a coal fired boiler used at the heating flue. I said the house was built in the 1960s, how's that !! He insisted that it could have been coal residue in the flue. Lack of common sense.