Barometric pressure range is 954 to 1073 millibars (mbar), 28.1 to 31.7 inches of mercury (inHg) and 715 to 805 millimeters of mercury (mmHg) Resolution is 0.5 mbar, 0.05 inHg and 0.5 mmHg Accuracy is ±0.5% of reading Dial barometer measures 4 1/2” diameter by 1…

Large, clear, dual scale Four inch dial is easy to read from a distance Gives readings in hecto Pascal (hPa) from 940 to 1060 readable to 1 hPa and mm of Hg pressure from 71 to 80 readable to .1mm. Barometer has an accuracy of ±± hPa. Complete with wall mounts. Weight: 2.6 oz.