Apparatus and Method for the Detection of Properties of a Pipe There is described herein a system for determining one or more properties of a pipe, the system comprising an attachment pad, at least one sensor configured to be coupled to the outside of a pipe wall, wherein the attachment pad is configured to overlie one or more of the at least one sensor such that the one or more sensor may be positioned between the pipe and the attachment pad, and to prevent slippage of the one or more sensor on the pipe. There is also described an attachment pad, a sensor, and a pipe.