The area of application for these pressure gauges are gaseous media. The scale ranges are between 0 … 2.5 mbar (0 ... 0.04 psi) and 0 … 1,000 mbar (0 ... 14.5 psi) in accuracy classes from 0.1 to 2.5. The construction of these pressure gauges consists of two circular, corrugated diaphragms, joined together around the rim with a pressure-tight seal. In certain cases overload protection is possible. The pressure gauges are used mainly within laboratory and vacuum technology or medical and environmental engineering for filter monitoring and contents measurement.