suitable for corrosive environments size:2",2.5",3",3.5",4",4.5",and 6"pressure range:-6...0 mbar up to 0 ... ):polycarbonate,and safety glass lens availabledial plate:single and dual scale(psi,kpa,mpa,bar,kg/cm2)availableaccuracy:+/- 3/2/3 ... :-25 to 55 degree centigrade;relative humidity below 80% dual scale diaphragm pressure gauge 0-30PSI