Furnace pipe inspection system is an apparatus for inspecting an conduit such as a furnace tube comprising at least first and second module shells, each shell having an axially contoured exterior, and a flexible, non-jointed intermodule connector joining the first and second shells. Preferably, each module has a length that is 1.0 to 2.4 times its outer diameter and the connector has a length that is 0.5 to 2.0 times the outer module diameter.