Confused Reading of Pressure on Vacuum Gauge I have a gauge used to measure vacuum but I'm a bit confused as the measurements state &quot;Hg&quot; (I would have supposed inches of mercury except it goes to -30) and &quot;Bar&quot; going to minus 1.
I need the pressure in Torr, how can I properly convert my readings?
I made a google conversion but it gives me a negative result in Torr which cannot be right.
Pressure gauges typically measure pressure relative to ambient, so &quot;0&quot; on a gauge means equal to ambient (~ 1 bar absolute pressure depending on where you are). In some cases, the units have a &quot;g&quot; at the end, for example &quot;psig&quot; to indicate that the measure is &quot;gauge pressure&quot; rather than absolute, but that isn't always the case.