THIS TYPE PRESSURE GAUGE IS USED AS THE COMPONENT OF THE REGULATOR PRESSURE GAUGEdiameter:2.5"(optional diameter:1.5",2 ... case:golden steel casewindow: snap on polycarbonate lensrange of pressure: 0-10bar,0-32l/min(or as your ... optional)brass internal and connectionsuitable gas:argonconnection:G1/4"(or as your optional, ... 1/2",bsp,bspt,npt,mpt)optional unit: bar,psi,mpa,kpa,kg/cm2