1Highaccuracy barometer, equipped with backlit LCD display, simple operation and clear reading. 2It can measure the maximum, minimum and average values, with data retention function. 3Digital differential pressure meter, which is a good helper for HVAC technicians and operation and maintenance. 4Various units of KPa, mmHg, InHg, Psi, Mbar, Bar, Ozin, Kgcm, InHO, FtHO, CmHO are available to meet needs of industries in different countries. 5Suitable for measurement and onsite inspection of ventilation and air conditioning systems, clean room, or any gas pressure system troubleshooting. Item Type: Differential ManometerMaterial: ABSModel: SW-512AMeasuring Range: 3.45KPAAccuracy: 1%FS, Maximum Error 35PaLimit The Maximum Pressure: 6.89KPaRepeatability: 0.25%FSResponse Time: 0.5SPressure Connector: 1/8in (3.18mm) Quick ConnectorWorking Temperature: 0-40, 10%-80%RHStorage Temperature And Humidity: -10-60, 10%-90%RHOver-Range Prompt: Err1 or Err2Power Supply: 3 x 1.5V AAA Battery (Battery Not Included) Measuring Range and Resolution Model SW-512A Unit Range Resolution KPa 3.45 0.01 MmHg 25.9 0.1 InHg 1.018 0.001 Psi 0.500 0.001 Mbar 34.5 0.1 Bar 0.034 0.001 Ozin 8.00 0.01 Kgcm 0.035 0.001 InHO 13.84 0.01 FtHO 1.153 0.001 CmHO 35.2 0.1 How to Use:1. Install the battery (3 x 1.5V AAA dry battery, not included)2. Press the power button3. Connect the hose to the adapter and port, and connect the adapter to the place where the air pressure needs to be tested4. According to the unit needs of different regions, press the button according to the UNIT unit conversion, DLF difference, recording mode, etc. 13.84 1.153