These vortex shedding flowmeters are designed for coolant or water flow from ¼ to 4 inch pipe sizes. Optionally, ¾ to 4 inch sizes have temperature transmitters. In ¼ and ½ inch sizes, 316 Stainless Steel bodies and Kalrez seals make it suitable for low viscosity corrosive fluids. They cost a lot less than mag meters and they are OK with high particulate. Simple, reliable and inexpensive.