Stainless steel case, Stainless steel roll ring,Polycarbonate window,oil filled Diameter:11/2",2",21/2",3",4"Connection:radial,bottom connection; axial,center back male connectionRange:0-100psi,... ...0-6000psiScale:psi,bar,Mpa,Kpa,kg/cm2Inlet thread:1/8",1/4",3/8",1/2",BSP,BSPT,NPT Liquid filled pressure gauge