"This instrument is based on the differential pressure measurement of two absolute sensors. The level sensor is connected by a cable to the electronics housing, which incorporates: the electronics with the latest µP-technology (16 Bit A\/D converter), the waterproof mounted absolute pressure sensor with steel diaphragm for air pressure measurement resp. -correction, the easily replaceable battery. The processor circuit collects the signals of the two pressure- and temperature sensors and calculates the differential pressure with an accuracy of 1...2 mbar for ranges up to 10 mWC."