Incorporating the principles of traditional rotameter flow technology, these rugged PTFE-PFA flow meters offer solutions to low to medium flow range measurements of highly corrosive or ultra-pure liquids. Model L Meters are constructed of inert materials such as PFA, PTFE and PCTFE. Wetted inert components are surrounded by structurally rigid materials such as PFA-clad aluminum, KYNAR® . The resultant design represents a unique combination of a rugged mechanically rigid frame and the chemically inert wetted parts.