HYDRO-USA Pressure gauges 2.5″ dial panel mount all Stainless steel corrosion resistant exterior and interior (case, mechanism, tube and process connection) with glycerine filled for low, medium and high pressure up to 0-20000 Psi (Accuracy 1 %). Ideal for hydrostatic pressure test and applications including chemical processing, oil field & offshore, paper mills, agriculture plants, marine and water & wastewater.