Dwyer 2002D Magnehelic® Differential Pressure Gauge is a versatile and accurate gauge for measuring pressure differentials in air and compatible gases. With a wide temperature range and IP67 enclosure rating, it is suitable for various environments. The die-cast aluminum housing and acrylic cover provide durability, and the gray exterior finish resists corrosion. The gauge includes standard accessories and has a 4" diameter dial face. It can handle pressures up to -20 in Hg to 15 psig.