Bourdon tube vacuum gauge
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Where is the zero point of this table? Does the middle position at the red line, the lower limit, or the area within the black line all represent zero? Waiting online
It is impossible to calibrate the zero point of a vacuum pressure gauge with such high precision; therefore, the entire range within the black line constitutes its zero-point range
The values within the black line range are all considered normal, as the manufacturer has taken into account the fact that atmospheric pressure varies from place to place.