Founded in 1931, Dwyer Instruments is the total instrument solution known for quality, reliability, and readily available low cost products. As a leading manufacturer of controls and instrumentation, we serve major markets with established brand names such as Magnehelic® pressure gauges, Photohelic® switch/gauges, Rate-Master® flowmeters, and Hi-Flow® valves. Dwyer continues to develop products to meet market and customer demands for pressure, air velocity, flow, level, temperature, and process controllers, sensors, switches, indicators & transmitters.