Digital Manometer Maximum Pressure 29 psi Minimum Pressure -29 psi Accuracy +/-1 Percent of Full Scale Process Connection Size 4/25 in Process Connection Type Quick Disconnect Batteries Included Yes Digital Display Features Dual LCD NIST Traceable Certificate No Series 407910 Application Air Non-Corrosive Gases Non-Ionized Gas Auto Power Off Yes Batteries Required Yes Battery Type 9V Calibration Certificate Included No Data Hold Yes Data Interface RS-232