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