Vacuum gauges measures pressures lower than the ambient atmospheric pressure. Also it is set as that zero point.
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Vacuum GaugesTesto 552 Digital Vacuum/Micron Gauge, temperature with Bluetooth
$182.75 TO-0560 5522 -
Vacuum GaugesYellow Jacket 69020 OMNI Vacuum Gauge and 69030 Vacuum Cleaning Kit
$161.81 YJ-69020-69030
