Feature: 1. High‑accuracy barometer, equipped with backlit LCD display, simple operation and clear reading. 2. It can measure the maximum, minimum and average values, with data retention function. 3. Digital differential pressure meter, which is a good helper for HVAC technicians and operation and maintenance. 4. Various units of KPa, mmHg, InHg, Psi, Mbar, Bar, Ozin², Kgcm², InH₂O, FtH₂O, CmH₂O are available to meet needs of industries in different countries. 5. Suitable for measurement and on‑site inspection of ventilation and air conditioning systems, clean room, or any gas pressure system troubleshooting. Specification: Item Type: Differential Manometer Material: ABS Model: SW-512A Measuring Range: ±3.45KPA Accuracy: ±1%FS, Maximum Error 35Pa Limit The Maximum Pressure: 6.89KPa Repeatability: ±0.25%FS Response Time: 0.5S Pressure Connector: 1/8in (3.18mm) Quick Connector Working Temperature: 0℃-40℃, 10%-80%RH Storage Temperature And Humidity: -10℃-60℃, 10%-90%RH Over-Range Prompt: Err1 or Err2 Power 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 Ozin² ±8.00 0.01 Kgcm² ±0.035 0.001 InH₂O ±13.84 0.01 FtH₂O ±1.153 0.001 CmH₂O ±35.2 0.1 How to Use: 1. Install the battery (3 x 1.5V AAA dry battery, not included) 2. Press the power button 3. Connect the hose to the adapter and port, and connect the adapter to the place where the air pressure needs to be tested 4. According to the unit needs of different regions, press the button according to the UNIT unit conversion, DLF difference, recording mode, etc. . Package List: 1 x Differential Manometer (Battery Not Included)4 x Plastic Hose2 x Quick Connector1 x Bag1 x Manual Note: