... , 0~6,000psi (dual scale)5. Coupling: Bottom or back connection6. Thread Coupling: M20x1,5, BSP, NPT, BS, UN...7. Ambient ... , Certificate of Utility Model Patent11. Dial plate: Single or dual scale (psi, kpa, mpa, bar, kg/cm) available12. Measuring medium: non-corrosive13 ... on switch lighted; when the voltage between 25 bar and 50 bar the red light on switch lighted. 50mm 0-400 bar cng pressure gauge