Precision Digital Manometer ±10 kPa Air Pressure Meter Differential Pressure Gauge Micromanometer for Gas Valves Pressure Switches Vacuum HVAC System Furnace Boiler Water Heater Air Conditioning Clean Room Features: 11 Selectable Pressure Units - bar, mbar, kPa, kgf/cm², mmHg, cmH2O, Ozf/in², psi, inHg, inH2O, ftH2O.  Wide Range & High Accuracy - Measures ±10 kPa at resolution of ±0.3% FSO (20℃) in full scale. Large LCD display with backlight, clear to read even under the dim light.  Useful Features - It is available to review Maximum, Minimum, Average values under record mode. Press the data hold button for easy data review. Built-in USB port allows connection with PC. Automatically power off in 1 minutes if there is no further operation to save the battery life. Low battery indicator reminds you to recharge the unit in time. Zeroing & Calibration - Pressure difference will automatically zeroing after turning off, and if there is any error between the device and your standard, you can calibrate it according to the user manual by yourself. Wide Application - Widely applied in measuring the pressure of fans, resistance, wind velocity, oven pressure, differential pressure of filter, and monitoring the gas content in the air in process of combustion. Parameters: range resolution maximum pressure  bar 0.1 0.001 0.5 mbar 100 0.1 500 kPa 10 0.01 50 kgf/cm² 0.101 0.001 0.509 mmHg 75 0.1 375 cmH2O 101.9 0.1 509.5 Ozf/in² 23.2 0.01 116 Note: *Battery not included. Specifications: Material: ABS Color: Black and Yellow Measuring Range: ±10 kPa Resolution: ±0.3% FSO (20℃) Repeatability: ±0.2% (max. ±0.5 FSO) Linearity/Hysteresis: ±0.29 FSO Response Time: Typical 0.5 seconds Low Battery Indicator: yes Up Overload Indication: Err1 Down Overload Indication: Err2 USB Connection: yes Battery: 1.5V, AAA battery, 4pcs(not included) Item Size: 17*7.5*3.5cm / 6.69*2.95*1.37in Item Weight: 237g / 8.35oz Package Size: 23.5*18.7*4.5cm / 9.25*7.36*1.77in  Package Weight: 416g / 14.67oz Packing List: 1 * Pressure Manometer 4 * Hose 1 * Disk 1 * USB Cable 1 * User Manual(English)