Yes, there are many ways to measure pressure.
* pascal (Pa) * bar * technical atmosphere (at) * atmosphere (atm) * torr (Torr) * pound-force per square inch (psi) * psia (pounds-force per square inch absolute) --- gauge pressure plus local atmospheric pressure. * psid (psi difference) --- difference between two pressures.
* psig (pounds-force per square inch gauge).
* psivg (psi vented gauge) --- difference between the measuring point and the local pressure.
* psisg (psi sealed gauge) --- difference between a chamber of air sealed at atmospheric pressure and the pressure at the measuring point. Check out the links for MUCH more information.