[High Precision]Liquid water flow control meter, measurement accuracy is better than plus or minus 1%; linearity and repeatability 0.2%; reading rate >0.6 ft/s; response time 9999 seconds; speed ±0.03 ±105 ft/s ( ±0.01 ±32 m/s), bidirectional. S=small (DN15-100mm); M=medium (DN50-700mm); L=large (DN300-6000mm). [Field work]Built-in day, month and year totalizer. It has power outage management function and working status diagnosis function, so that all accumulated content, date and time are stored in the memory (24k, can store 2000 rows of data), and there is no problem of data loss. Built-in rechargeable battery, continuous working time up to 12 hours, enabling mobile field work. [External Clamp-On Design for Easy Installation]:As a portable clamp on flowmeter it clamps onto existing pipes without cutting or modification making installation faster and less disruptive than inline flow meters for factory or shop use [4-Line LCD Display for Comprehensive Monitoring]:The 4-line display shows instantaneous flow rate cumulative flow signal status and more simultaneously giving you more information at a glance than single-line displays [Application Scope]Can be used for flow testing ETC of seawater, clean water, alcohol, river water, cold water, hot water, industrial sewage, lubricating oil, diesel, fuel oil, and chemical liquids in PVC, stainless steel, cast iron, and fiberglass pipes.