Detailed Product Description 6" pressure gaugesSizes: 2.5, 4 inchesCase material: black steel Tube and socket: stainless steel Connection: M20*1.5,1/2-inch PF, 1/8, 1/4, and 3/8-inch PF, NPT, BSP or BSPT available Type: bottom Scale range: 0-160mpaWindows: glass, acrylic, perspex and polycarbonate lens are available Accuracy class: 1.0, 1.6, 2.5