Applications Used for hydraulic and pneumatic systems Compressors,compressed air system Suitable for fluid medium which does not clog connection port or corrode copper alloy Case:Stainless Steel Ring:No Window:Acrylic Socket & Connection:Brass Movement:Brass Bourdon Tube:Copper alloy Pointer and Dial:Aluminum Range:Vacuum,Compound 0 to 6000 psi Class:1.6% Mounitng Type:Back