Detailed Product Description 3" Oil Pressure gauge Case material: 304 stainless steel caseCase size: 1.5, 2, 2.5, 3, 4 and 6 inches Tube and socket: brass Connection: 1/8, 1/4, 3/8 and 1/2 inches BSP, NPT or BSPT Type: bottom and back Scale ranges: -1 to 0 to 600bar Window material: PC and anti-explosion Accuracy: 1.0, 1.6 and 2.5%