Description Trace drains, sewers and other non-conductive utilities using the maxi sonde. The maxi sonde has a M10 male thread with an additional female adaptor and can be attached to a range of equipment including drain rods, boring tools and inspection cameras. Powered by 3 x AA alkaline batteries with a depth range of 12 meters (39.4ft) Operates at 8kHz or 33kHz
