Detailed Product Description 4" Pressure gaugeCase sizes: 2.5 and 4-inch are availableCase material: 304 SSTube and socket: brassConnection: 1/2, 1/4, 3/8 inches, NPT, BSP or BSPTType: bottom or backScale range: -1 to +600 barsWindows: acrylic, glass, anti-explosion and polycarbonate availableAccuracy: 1.0, 1.6 and 2.5Options and accessories: custom dial, metric scale, DIN 2.5 accuracy, ...