Features 1、Digital display differential pressure gauge, rubber hose can be easily sleeved, convenient for measurement. 2、13 kinds of pressure units are selected to meet the measurement requirements of different countries and regions. 3、With a USB interface, it can be connected to a computer, and the data transmission is faster. 4、Air pressure gauge, 0.5S quick response, high sensitivity, accurate measurement, compact and portable. 5、Widely used to measure the pressure of fans and blowers, filter resistance / wind speed / furnace pressure / orifice pressure, etc. Specification Item Type: Differential Pressure Gauge Material: ABS Measuring Range: ±100kPa Accuracy: ±0.3%FSO (25℃) Repeatability: ±0.2% (Maximum +/-0.5% FSO) Linearity/Hysteresis: ±0.29% FSO Response: 0.5S Typical Low Battery Indicator: Support Overload Indication: Err1 Downward Overload Indication: Err2 Working Temperature: 0-50℃ Storage Temperature: -10-60℃ Power Supply: 4 x 1.5V AAA Battery (Battery Not Included) USB Communication: Support Model Unit Range Resolution Maximum Pressure GM522 bar 1 0.001 4 GM522 mbar 1000 0.1 4000 GM522 kPa 100 0.01 400 GM522 kgf/cm² 1.019 0.001 4.078 GM522 mmHg 750 0.1 3000 GM522 cmH₂O 1019 0.1 4078 GM522 Ozf/in² 227.5 0.01 910.2 GM522 pSi 14.5 0.001 58.01 GM522 inHg 29.52 0.01 118.1 GM522 inH₂O 401.4 0.1 1605 GM522 ftH₂O 33.45 0.01 133.8 How to Use: 1. Install the battery 4pcs 1.5V AAA batteries (not included) 2. Connect the pressure port to the hose and connect to the unit under test 3. Start and measure according to your needs, select the appropriate pressure unit (press UNTS to convert the unit), HOLD (data hold), DIF (difference button), REC (record button) Package List 1 x Differential Pressure Gauge (Battery Not Included) 1 x USB Cable 4 x Plastic Tube 1 x CD 1 x Manual