The J-2000 Series of Aero Type Differential Pressure Gauges is designed for the HVAC industry. The gauges feature a frictionless gauge movement, and respond quickly to indicate low pressures, whether positive, negative (vacuum), or differential. Magnetic components of the spiral movement have been replaced with a rubber film, a sensitive component in measuring pressure. This design resists shock, vibration, and over pressures without fluid fill. The result is no difficulty with evaporation, freezing, or leveling that as found in other gauges.