Pressure Setting Range (Manual Control (Constant Value Control)): VAC, 1 ~ 1013 hPa (mbar) (VAC, 1 to 101.3 kPa)(VAC, 1 to 760 mmHg (Torr)) ? (Auto Control (Automatic Control)): Automatic gradient control of pressure suitable for data and operating conditions, Automatic Constant Value Pressure Setting Control ? (Program Control (Gradient Control)) 55 representative solvents internally set ? (Step Program Control)