RTS Tooling’s Pressure Differential (PD) Valves measure pressure differentials in the valve flow area without obstructing the flow path of the air being tested. This allows users to obtain accurate, repeatable results along with additional information not typically compiled in air flow tests using standard mapping technology. The included PD Valve software compiles and stores all the data from tests numerically. The program also graphically displays pressure differentials in color, as well as, velocity and radial flow. As a result, the PD Valve Software is able to identify specific problem areas in the test subject and provide valuable data for improvements.