Mec-O-Matic Flow Meters are easy to maintain, easy to install monitors of the volume solution flow. Attaches to the outside of a solution line with clamps that wrap around the line. Constructed of durable clear acrylic material is calibrated in GPM/LPM with easy-to-read numbering. Flow Meters have a red indicator showing the direction the solution should flow in relation to the flow meter. For use with any solution.