Druck DPI104-13G-5491 Digital pressure indicator Hydraulic, Pneumatic 20bar 1/4 in, Interface Type RS232 DPI104. Combining precision and functionality within a compact and robust design, the DPI 104 range of digital pressure indicators are microprocessor-controlled gauges. Featuring advanced silicon sensor technology and convenient design features to create an accurate and versatile test gauge. These pressure gauges are digital with a digital display and are network-capable alternatives to standard analogue test gauges.