Absolute Pressure of atmosphere

What is the meaning of Absolute pressure of atmosphere?

According Setra, who supply pressure sensors etc, absolute pressure is measured relative to a full vacuum. Pressure that is measured against atmospheric pressure (also known as barometric pressure) is called gauge pressure. A full vacuum has an absolute pressure reading of 0 PSIA
When measuring gauge pressure, current atmospheric pressure is the baseline and is therefore read as 0 PSIG

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