The DMTF Wall-mount Clamp-on Ultrasonic Flowmeter family provides abundant capabilities for accurate liquid flow measurement from outside of a pipe. It utilizes state-of-the-art technologies on ultrasonic transmission/receiving, digital signal processing and transit-time measurement. The proprietary signal quality tracking and self-adapting technologies allow system to optimally adapt to different pipe materials automatically. The flow meters of the DMTF family are carefully designed so that their user-interfaces are self-explain atory and their operation is simple and easy. The unique clamp-on fixture design makes the installation very simple and no special skills or tools are required. Due to the non-invasive nature of the clamp-on the technology, there is no pressure drop, no moving parts, no leaks, no risk of contamination, no risk of corrosion, no pressure dependency.