Dwyer 4203 Capsuhelic® Differential Pressure Gauge is a reliable and accurate instrument designed for measuring pressure differentials in a variety of applications. With an temperature range of 20 to 200°F and an accuracy of ±3% of FS at 70°F, it is suitable for use with air, compatible gases, and oil-based liquids. The gauge features a durable die-cast aluminum housing with optional forged brass for water-based fluids. It comes with 1/4" female NPT high and low pressure taps and includes standard accessories for easy installation.