Preso manufactures a complete line of precision engineered primary flow elements including the patented Ellipse pitot, Venturi and segmented wedge flow meters for the industrial, municipal and pollution control markets. With this array of products, Preso can provide a meter for any process that can be measured with differential pressure technology, often at calibrated accuracies of better than +/- 1%. Preso also manufactures the B+ and C+ lines of metering, balancing and connection valves for the HVAC industry.