Druck DPI612-PFX-7A Pressure Calibrator with FREE UPS II: The Druck DPI612-PFX-7A is a high-accuracy pressure calibrator with a wide pressure range and a variety of features. It is ideal for use in a variety of applications, including calibration, testing, and maintenance. The DPI612-PFX-7A comes with a FREE UPS II, which provides uninterruptible power supply in the event of a power outage.