The series of Biotech Liquid Flow Meters enables easy, continuous, and integrated determination of liquid flow rates. With these devices, flow data is continuously and accurately recorded and stored in a computer application providing full flow control and documentation. The measurement principle of heat dispersion allows for unprecedented time resolution and provides new insights into flow variation and inconsistency. The internal flow cell has a minimal volume and the inline measurement is accomplished without any interference with the liquid or its flow path. Four different models are available for micro flow, analytical HPLC flow, preparative flow, and high volume flow rates.