Dwyer 4150 Capsuhelic Differential Pressure Gauge is a reliable and accurate gauge suitable for measuring differential pressure in a wide range of applications. It has a temperature range of 20 to 200°F and an accuracy of ±3% at 70°F. The housing is made of die-cast aluminum with a hard coating, and optional forged brass housing is available for water-based fluids. It can be used with air, gases, and oil-based liquids. The gauge has a 4" diameter dial face and 1/4" female NPT high and low pressure taps. It comes with standard accessories including plugs, mounting adapters, and screws.