... size4. Measurement range: 0~400bar, 0~6,000psi (dual scale)5. Coupling: Bottom or back connection6. Thread Coupling: M20x1 ... 8. Relative humidity: ≤80%9. Wire connection: white wire ,output signal red wire , positive Voltage black wire, negative Voltage10. Certification: ... , Certificate of Utility Model Patent11. Dial plate: Single or dual scale (psi, kpa, mpa, bar, kg/cm) available12. Measuring ...