Traceable® Precision Dial Barometer's triple scales provide a sensitive measure of atmospheric pressure from 954 to 1073 millibars, 28.1 to 31.7 inches of mercury, and 715 to 805 millimeters of mercury with a resolution of 0.5 mbar, 0.05 InHg, and 0.5mmHg. Accuracy is ±0.5% of reading. Individually serial numbered Traceable® Certificate is provided to indicate traceability to standards provided by NIST. Housed in a rugged corrosion-proof nickel-chrome case. Adjustable pointer may be set to indicate changes. Complete with altitude adjustment screw (use at locations as high as 1000 meters), notched desk stand and wall mount. Size is 4-1/2 inches diameter by 1-1/2 inches; weighs 1 pound.