The meter can measure the differential pressure conveniently. It features 11 selectable units of measure, and used for testing ventilation and air conditioning system, spot check, clean room, or any gas pressure system troubleshooting. Features: Large LCD backlight display, providing clear reading. 11 selectable units for measurement, convenient for use. Max. or Min. or Average values, and with a relative time clock. Low battery indicator and pressure unit indicator. Zero adjustment, offset and DIF function. Data hold and automatically shutdown function. Specification: Model: HT-1890 Display: LCD Backlight InH2O Range: 55.40 Resolution: 0.01 Psi Range: 2.000 Resolution: 0.001 Mbar Range: 137.8 Resolution: 0.1 Kpa Range: 13.79 Resolution: 0.01 InHg Range: 4.07 Resolution: 0.001 MmHg Range: 103.4 Resolution: 0.1 Ozin2 Range: 32 Resolution: 0.01 FtH2O Range: 4.612 Resolution: 0.001 CmH2O Range: 140.6 Resolution: 0.1 Kgcm2 Range: 0.140 Resolution: 0.001 Bar Range: 0.137 Resolution: 0.001 Accuracy: 0.3 percent FSO(25C) Repeatability: 0.2 percent (Max. 0.5 percent FSO) Linearity or Hysteresis: 0.29 percent FSO Max. Pressure: 10Psi Response Time: 0.5s Typical Low Battery Indicator: Yes Over Range Indicator: Err. 1 Under Range Indicator: Err. 2 Operating Condition: 0-50C or 32-122F Storage Condition: -10-60C or 14-140F Power Supply: 1 x 9V Battery (NOT Included) Size: 16x5.5x3.2cm or 6.3x2.2x1.3in Weight: Approx.268g or 9.5oz Package List: 1 x Digital Manometer(Battery NOT Included) 1 x Black Pouch 4 x Flexible Tube 1 x Metal Accessory 1 x User Manual (English) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.