Fieldpiece AVG2 Digital Vacuum Gauge Accessory Head,Standard Plumbing Supply,AVG2" /> Displays pressure in microns in steps of 1 micron Range: 50 to 2000 microns of mercury Resolution: 1 micron of mercury Pump down indication: when pumping down from atmospheric pressure to 2000 microns, output of head goes from over 3VDC to 2VDC Straight-in access to sensor for easy cleaning