... , so that the gauge can be used longer.Specification:1. Type: YRF 2. Accuracy rating: 2.53. Case Diameter: 50mm=2 ... Voltage10. Certification: ISO9001:2008, Certificate of Utility Model Patent11. Dial plate: Single or dual scale (psi, kpa, mpa, bar, kg/cm ... and 50 bar the red light on switch lighted. Waterproof type CNG pressure gauge