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 place 2、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(P1‑P2) 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 accurate 5、EXCELLENT PERFORMANCE: Differential pressure gauge is made with fine workmanship, possess compact appearance and stable performance, can make sure durability and stability Item Type: Digital Differential Pressure Gauge Measurement Accuracy: ±0.3%FS Repeatability: ±0.25%FS Measuring Range: ±35.1kpa Maximum Limit Pressure: 70.2kpa Power Supply: 1 x 9V battery(not included) Storage Temperature Range: -10-60℃ Linearity or Hysteresis: Full scale ±0.1%FS Pressure Source Connection: Pagoda head Overrange Warning: ERR1 or ERR2 1 x Digital Differential Pressure Gauge 1 x Cloth Bag 2 x Hose 1 x User Manual