Features Complete functions: The digital manometer has 11 air pressure units and complete functions. The differential pressure gauge has a low battery prompt function, and can choose an automatic shutdown function, an over-range prompt function and a calibration function. Detection accuracy: Differential pressure measurement is an ideal choice for measuring ventilation and air conditioning systems. The detection accuracy of differential pressure gauge digital is ±0.3% FS Data retention function: The differential pressure gauge has the function of recording and viewing the maximum, minimum and average pressure values, as well as the function of data retention. Backlight display: The differential pressure gauge design large backlit display makes the data display clearer, no need to worry about light interference, and the reading is more convenient Working temperature: The size of the digital manometer gauge is about 150*55*40mm / 5.9*2.2*1.6in. It needs to be powered by a 9V battery, which is not included in the package. The working temperature of the digital manometer is 0~40°C, and the storage temperature range is -10~60°C Features: The differential pressure gauge has 11 air pressure units and is fully functional. Differential pressure measurement is ideal for measuring ventilation and air condition systems. With maximum, minimum, average pressure value recording and viewing capabilities, and data retention features. Large with backlit display for clearer data display. There is a low battery prompt function, you can choose the automatic shutdown function, overrange prompt function and calibration function. Specifications: Condition: 100% Brand New Material: Plastic Range: +2psi Accuracy: ±0.3% FS Linearity/hysteresis: ±0.1% of full scale FS Repeatability: ±0.25% FS Pressure connection: two 1/8" (3.18 mm) quick connectors Working temperature: 0~40°C Storage temperature range: -10~60°C Product size: approx. 150*55*40mm / 5.9*2.2*1.6in Battery type: 9V battery (Battery not included) Package list: 1 * Digital pressure gauge (Battery not included) 2 * Plastic hose 1 * Metal connector 1 * Portable bag 1 * English manual Note: 1.Please allow 0-1 inch 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. Package List