Just because sophisticated ‘high-tech’ instruments are available, it does not mean we have to use them: simple meters can offer many advantages over more costly and technical types. Although flowmeters may seem to be a modern invention, basic types were evident as far back as the early Roman era. They were often used for measuring water flow to households. The mathematical foundations of flow theory were evolved during the 17th century. Flow rate is a product of the velocity of a fluid and volume