Feature:1. LCD DISPLAY: The digital differential pressure gauge come with a backlit LCD screen, which is very convenient when working at night or in any dark place2. POSITIVE AND NEGATIVE PRESSURE MEASUREMENT: There are two ports on the top of the manometer, one for testing positive pressure and the other for testing negative pressure. You can select any port to test the pressure difference between the two zones(P1P2)3. EFFICIENT AND FAST: Using the single tube connection of the air pressure gauge, you can quickly measure the current pressure value(relative to the current atmospheric pressure)4. DATA RECORDING, KEEPING AND ZEROING: Differential pressure gauge data storage support 100 groups; Digital pressure gauge record test data function design is humanized, convenient for users to view after the test; The zeroing function of the gas manometer data is easy to operate, so the reading is accurate5. EXCELLENT PERFORMANCE: Differential pressure gauge is made with fine workmanship, possess compact appearance and stable performance, can make sure durability and stabilitySpecification:Item Type: Digital Differential Pressure GaugeMeasurement Accuracy: 0.3%FSRepeatability: 0.25%FSMeasuring Range: 35.1kpaMaximum Limit Pressure: 70.2kpaPower Supply: 1 x 9V battery(not included)Storage Temperature Range: -10-60Linearity or Hysteresis: Full scale 0.1%FSPressure Source Connection: Pagoda headOverrange Warning: ERR1 or ERR2.Package List:1 x Digital Differential Pressure Gauge1 x Cloth Bag2 x Hose1 x User Manual