Features Complete functions: the digital pressure gauge has 11 air pressure units and complete functions. The differential pressure gauge has a low battery prompt function and can choose between an automatic shut-off function, a range exceeding prompt function and a calibration function. Detection accuracy: the differential pressure measurement is an ideal choice for measuring ventilation and air conditioning. The detection accuracy of the digital differential pressure gauge is ±0.3% FS Data storage function: the differential pressure gauge has the function to record and display the maximum, minimum and average pressure values, as well as the function of data storage. Backlight Indicator: The large backlit display of the differential pressure gauge makes the data display clearer, you don't have to worry about light interference and reading is more convenient Working temperature: the size of the digital pressure gauge is about 150 x 55 x 40 mm / 5.9 x 2.2 x 1.6 inches. It must be powered by a 9V battery, which is not included. The working temperature of the digital pressure gauge is 0 ~ 40 °C and the storage temperature range is -10 ~ 60 °C Functions: The differential pressure gauge has 11 air pressure units and is fully functional. Differential pressure measurement is ideal for measuring ventilation and air conditioning systems. With capabilities to record and display maximum, minimum, and average print values as well as data storage functions. Large with backlit display for clearer data viewing. There is a low battery prompt, you can choose the automatic shut-off function, the prompt function for the range exceeding and calibration function. Specifications: Condition: 100% Brand New Material: plastic. Range: +2psi. Accuracy: ±0.3% FS. Linearity / hysteresis: ±0.1% of scale end value FS. Repeatability: ±0.25% FS. Pressure connection: two 1/8 inch (3.18 mm) quick couplings. Working temperature: 0~40°C. Storage temperature range: -10~60°C. Product size: approx. 150 x 55 x 40 mm / 5.9 x 2.2 x 1.6 inches. Battery type: 9 V battery (battery not included). Package contents: 1 x digital pressure gauge (battery not included). 2 x plastic hose. 1 x metal connector. 1 x portable bag. 1 x English manual. Note: 1. Please allow 0-1 inch error due to manual measurement. Thank you for your understanding. Monitors are calibrated differently, so the colour of the item shown in the photos may differ slightly from the real object. Please take the real one as standard. Package List