Other Functions -- This digital differential pressure gauge can also be used for temperature measurement, and it supports / switchable. Data hold/ data storage (100 groups)/ data search function, maximum/ minimum data mode. Dual Power Supply Method -- Powered by 9V battery (not included) or external USB cable. Low power MCU designed. Automatically shut down after 15 minutes idle time to save power. 6.8V low battery indicator for convenient use. Scope of Application -- Widely used in natural gas pipelines, air-conditioning refrigeration and ventilation systems, mechanical hydraulics, plastic molding, ceramic products, biopharmaceutical molding, mining area pressure detection, petrochemical refining, gas, liquid, and production industrial equipment pressure detection. Note: 1. Color and size may be slightly different due to manual measurement and different light conditions. Thanks for understanding. 2. Please read the user manual carefully before use. Specifications: Model Color: 168B Red/ 169B Yellow (Optional) Material: ABS Unit of Measurement: kPa, Psi, kg/cm, ozin, bar, mbar, inHg, mmHg, inHO, ftHO, cmHO, Pa (Pa is for 168A only) Accuracy: 0.3% FSO Repeatability: 0.2% (MAX0.5% FSO) Measurement Rate: 0.5s Data Storage: 100 Groups Low Battery Indicator: 6.8V Positive Pressure Range Display: Err0 Over Negative Pressure Range Display: Err1 Working Temperature: 0~50 (32~122) Power Supply: 9V Battery (not included) or External USB Cable Item Size: 164 * 71 * 35mm / 6.46 * 2.80 * 1.38in Item Weight (without battery): 151g / 5.33oz Package Size: 18 * 10 * 4cm / 7.09 * 3.94 * 1.57in Package Weight: 267g / 9.40oz Package List: 1 * Digital Manometer 1 * Air Nozzle 2 * Tube 1 * USB Cable 1 * User Manual (English) 1 * Carry Bag