1. Non-invasive transducers are easy to install, cost effective, and require no pipe cutting or processing interrupt. 2. Wide liquid temperature range: -35~200. 3. Data logger function. 4. 14 hours battery(rechargeable), back-lit 4 lines display. 5. For commonly used pipe materials and diameters from 20mm to over 6.0m. 6. Wide bi-directional flow range of 0.01 m/s to 12 m/s.