The Noshok 900 Series Pressure Gauges are extremely high quality pressure gauges available in a liquid filled version for extended service life and shock resistance. They have a stainless steel case with polycarbonate lens and are designed with a unique o-ring case and connection seal, which guards against leakage and protects against shock and vibration. In addition, they have a relief disc on top and on the back that provides positive case relief. Noshok uses high grade glycerine fluid that dampens the effects of pulsation, vibration and shock loads, and provides lubrication of the movement. The applications for these pressure gauges include food processing, chemical plants, paper mills, and much more!Specifications:Face Diameter: 2.5"Mount Type: Center BackConnection: 1/4" MPTGauge Type: Liquid FilledPressure Range: 0-600 PSITemperature Range: 0-140 °FCasing: 304 Stainless SteelInternals: BrassStem: Brass Face: Molded Plastic with Black/Red PrintLens: PolycarbonatePointer: Molded PlasticFluid: Glycerine and waterWarranty: 3 years