How it works:                1. Select your column dimensions (internal diameter, film thickness, and length). Double-tap column length to enter an exact value.        2. Choose your outlet pressure (atmospheric, vacuum, or other); if you select Other, an input box will appear where you can type in a specific value        3. Choose your carrier gas (H2, He, or N2)        4. Set your oven temperature using the slider or double-tap to enter an exact value        5. In the Inlet Pressure mode, use the slider to select the outlet flow or double-tap to enter an exact value—the calculated inlet pressure is displayed at the top of the screen        6. In the Outlet Flow mode, use the slider to select the inlet pressure or double-tap to enter an exact value—the calculated outlet flow is displayed at the top of the screen                Pressure can be displayed in psi, KPa, or bar and can be changed at any time. You also can display average velocity and holdup time. Simply select your preferences in Settings.                This useful tool can help users of all gas chromatographs and columns, but is especially useful for an Agilent 7890A, 7820A, 6890 Series, or 6850 Series GC system with our state-of-the-art electronic pneumatics control (EPC) and high-quality Agilent J&W capillary columns.