Koolance’s inline flow meters provide electronic indication of real-time coolant flow rate. G 1/4 BSPP fitting threads, and primary materials are nickel-plated brass and acrylic. Approximate read range is 1.0-20 LPM (15.6-317 GPH). Wire length is about 28″ (70cm). INS-FM19 is identical to INS-FM17N, but has an external metal shell for greater durability.