The FD613 series flow meter uses advanced reverse phase measurement technology to provide accurate and reliable flow rate assessment for closed pipeline systems. This series of flow meters uses a non-invasive clamp-on sensor that can be placed outside the pipeline. Within seconds, the large 18 mm (0.7") LCD display displays a stable flow rate reading in either feet/second or meters/second. This product can be used in applications containing more than 100 ppm of 100 micron or larger suspended solids. Or work in metal or plastic pipes through which liquid mixed with gas flows.