Product Description 1. Double products double nozzles double displays double pumps double flow meter 2 Ambien: -40 degree to +55 degree Humidity: 45% to 75% 3. Max flux: 50L/min or 90L/min 4. Accuracy: More or less 0.3% 5. Repeating error: Less 0.15% 6. Inlet pressure: >54kpa 7. Outlet pressure: Less 0.3MPa 8. Power: 380V 50Hz (make it clear, if need 220V) 9. Noise less 80dB 10. Unit price range: 0.01-99.99 11. Single volume range: 0.01-9999.99 12. Explosion-proof certifcate: CEO11195 13. Explosion-proof signal: Exdm AT3