Digital Manometer, Maximum Pressure 120 in wc, Minimum Pressure -120 in wc, Accuracy +/-0.2 Percent of Full Scale, Process Connection Size 1/4 in, Process Connection Type Hose Barb, Batteries Included Yes, Digital Display Features 5 Digit Backlit LCD, NIST Traceable Certificate No, Series 621, Auto Power Off Yes, Batteries Required Yes, Battery Type 9V, Calibration Certificate Included No, Display Units in H2O, in Hg, kPa, mbar, mm H2O, mm Hg, psi