Precision Barometer, Pressure Range (in Hg) 28.1 to 31.7 in Hg, Pressure Range (hPa) 945 to 1073 hPa, Pressure Range (mm Hg) 715 to 805 mm Hg, Accuracy +/-0.5 Percent, Response Time 1 to 4 hr, Mounting Location Wall-Mount, Overall Depth 1 1/2 in, Overall Diameter 4 1/8 in, Includes NIST-Traceable Calibration Certificate Yes, Scale Type Analog, Scale Units hPa, in Hg, mm Hg, Adjustable Pointer Yes, Altitude Adjustment Screw Yes, Yes, Dial Color White