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. _x000D_ _x000D_ _x000D_ Features: _x000D_ Large LCD backlight display, providing clear reading. _x000D_ 11 selectable units for measurement, convenient for use. _x000D_ Max./Min./Average values, and with a relative time clock. _x000D_ Low battery indicator and pressure unit indicator. _x000D_ Zero adjustment, offset and DIF function. _x000D_ Data hold and automatically shutdown function. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Model: HT-1890_x000D_ _x000D_ Display: LCD Backlight_x000D_ InH2O Range: 55.40; Resolution: 0.01_x000D_ Psi Range: 2.000; Resolution: 0.001_x000D_ Mbar Range: 137.8; Resolution: 0.1_x000D_ Kpa Range: 13.79; Resolution: 0.01_x000D_ InHg Range: 4.07; Resolution: 0.001_x000D_ MmHg Range: 103.4; Resolution: 0.1_x000D_ Ozin2 Range: 32; Resolution: 0.01_x000D_ FtH2O Range: 4.612; Resolution: 0.001_x000D_ CmH2O Range: 140.6; Resolution: 0.1_x000D_ Kgcm2 Range: 0.140; Resolution: 0.001_x000D_ Bar Range: 0.137; Resolution: 0.001_x000D_ Accuracy: 0.3%FSO(25C)_x000D_ Repeatability: 0.2%(Max. +/-0.5%FSO)_x000D_ Linearity/Hysteresis: 0.29%FSO_x000D_ Max. Pressure: 10Psi _x000D_ Response Time: 0.5s Typical _x000D_ Low Battery Indicator: Yes_x000D_ Over Range Indicator: Err. 1_x000D_ Under Range Indicator: Err. 2_x000D_ Operating Condition: 0~50C / 32~122F_x000D_ Storage Condition: -10~60C / 14~140F_x000D_ Power Supply: 1 * 9V Battery (NOT Included)_x000D_ Size: 16*5.5*3.2cm/6.3*2.2*1.3in_x000D_ Weight: Approx.268g/9.5oz_x000D_ _x000D_ _x000D_ Package List:_x000D_ 1 * Digital Manometer(Battery NOT Included)_x000D_ 1 * Black Pouch_x000D_ 4 * Flexible Tube_x000D_ 1 * Metal Accessory_x000D_ 1 * User Manual (English)