Transmitting sondes enable receivers to trace non metallic sewers, drains, ducts or pipes and to locate blockages or collapses. The C.A.T.+ used in conjunction with the Mega Mouse are the ideal tools for locating drain blockages. The Mega Mouse sonde combines compact size with a strong signal. It is the standard for most applications unless a smaller size, greater depth or specially rugged construction is required. Items can be supplied individually.