High Pressure Gauge. Case material: Black Steel and Wrap stainless bezel; Window: Perspex; Size: 2.3"(58mm), other size available; Bottom Connection: Brass; Brass internal. Thread Size: 1/4" BSP; Thread Style: Radial connection; Bourdon Tube: Spiral shape; Dial and pointer: Aluminum; Accuracy Grade: 2.5%/1.6%; Pressure Range: 0~400 bar. We can make series gauges for different gas with diameter from 1" to 6". Dry type and oil filled type are all available. Any question or inquiry, you are welcome to contact us at your earllier.