Absolute Pressure Manometer With Model Name/Number 150-0-150 mm H2O an be measured using an electronic diaphragm sensor, where the measured pressure is applied on one side of the diaphragm, while the other side of the diaphragm is exposed to a permanently sealed vacuum. Absolute pressure gauges are typically used in research and scientific laboratories where fluctuating atmospheric pressure can become an issue and in aeronautics where precise measurements are critical to determine altitude.