The F-41000LN-16 Blue White Flow Meter is made from tough machined acrylic meter body, polished to a clear finish. Direct reading permanent scale. White back reflector for easy reading. Viton o-ring seals. (Optional K-series hastelloy C-276). Standard models #316 stainless steel, PVDF, Teflon float. (Optional K-series hastelloy C-276, PVDF, Teflon). Acceptable in direct sunlight applications. Available OEM options: Private labeling, custom calibrations, custom materials. Performs better than the competition. Top quality at low prices. MTR2 2 -20GPM ACY 1.0 FPT