Dwyer 4015 Capsuhelic® Differential Pressure Gauge is a reliable and accurate instrument suitable for a variety of applications. It has a temperature range of 20 to 200°F (-6.67 to 93.3°C) and offers an accuracy of ±3% of FS at 70°F (21.1°C). The gauge features a die cast aluminum housing with an impregnated hard coating, but a forged brass housing is required for water or water-based fluids. The gauge is compatible with air, gases, and oil-based liquids for the aluminum case, and air, gases, and water-based liquids for the brass case. It has a 4" diameter dial face and comes with standard accessories like pressure taps and mounting adapters.