Feature: 1. With 11 selections of measuring unit: kPa, psi, kgfcm², ozin², bar, mbar, inHg, mmHg, inH₂O, ftH₂O, cmH₂O. 2. Complete functions, differential pressure measurement is very suitable for measuring ventilation and air conditioning systems. 3. With the maximum, minimum, average pressure value recording and viewing function and data hold function. 4. Large backlight display screen, over‑range prompt, calibration function, is a good helper for measuring pressure. 5. Compact size and light weight, easy to operate and carry. High quality ABS material, wear-resistant, anti-aging, durable. Specification: Item Type: Digital Manometer Material: ABS Color: As shown in the picture Size: Approx. 150x55x40mm / 5.91x2.17x1.57in Weight: Approx.200g/7.1oz Range: +5psi Accuracy: ±0.3%FS Linearity/Hysteresis: ±0.1% FS of full scale Pressure Range: 2Psi Repeatability: ±0.25%FS Response Time: 0.5 seconds Pressure Connection: Two 1/8in (3.18mm) quick connectors Working Temperature: 0~50°C (32~122°F) Storage Temperature Range: -10~60°C (14~140°F) Battery Type: 9V battery (not included) Operation Method: First open the back cover, install the battery, press and hold the power button for 2 seconds to start up, the screen displays the parameters, adjust the measurement range, you can use it. Function: 1.11 air pressure units 2. Differential pressure measurement 3. Maximum, minimum, average pressure value recording and viewing function 4. Data retention function 5. Large backlit display 6. Low battery reminder function 8. Over-range prompt function 9. Calibration function Pressure functional unit Range Resolution Kpa 34.47 0.01 Psi 5 0.001 kgfcm² 0.351 0.001 ozin² 80 0.1 Bar 0.344 0.001 Mbar 344.7 0.1 inHg 10.18 0.01 mmHg 258.5 0.1 inH₂O 138.3 0.1 ftH₂O 11.53 0.01 cmH₂O 351.5 0.1 . Package List: 1 x Digital Manometer(Battery Not Included)1 x Bag2 x Hose1 x Metal Connector1 x Instruction Manual Note: 1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.