I am having the chimney swept, but I would also like a camera inspection with a video so I can watch. I am also requesting a chimney draft test. I would like one with an instrument no swaggered. What is the name of the instruments and how is the proper test performed. I have an 25 foot interior masnry chimney with 8 x 8 clay flue. I would like to be educated so I know what I am speaking about. Also what is considered a good reading? If there is glazing I would like him to address it right away and use frail (spelling) chains to clean the flue.