Metal leadframes, semiconductor packages made using the leadframes, and methods of making the leadframes and packages are disclosed. The carriage assembly includes at least one transmitterreceiver unit capable of transmitting a pulsed signal toward at least a portion of an inner wall of the conduit, and a secondary sensor positioned on the carriage assembly. The input signal circuit block includes a plurality of different kinds of board blocks provided replaceably according to a plurality of different forms of signals. This multi-bit mixer is suitable for an integrated circuit with application to a broadband digital radio frequency receiver, a digital correlation receiver, or a digital radio frequency transmitter. The system further including a cable-length calibration method, an automatic material identification and calibration method, a material insensitive method, an inductive ratio method and advanced sensing characteristics.