Electronic digital barometers measure atmospheric pressure, graphically display the barometric trend, and report relative humidity and temperature. Barometer measures pressure from 23.45 to 31.01 inches of mercury (inHg) with a resolution of 0.03 inHg, and from 794 to 1050 millibars (mbar) with a resolution of 1 mbar. Accuracy is ±0.1477 inHg (±5 mbar). Ideal for recording ambient changes in the lab, monitoring conditions affecting sample analysis and assisting in the prediction of weather changes. Memory stores barometric readings. Graphic barometric trend shows present reading and previous 1-, 3-, 6-, 12- and 24-hour readings in a bar-chart format. Hourly digital barometric readings are stored in memory and can be recalled and displayed for each of the past 24 hours. There is adjustable altitude compensation from 0 to 2500 meters. Units display relative humidity with a resolution of 1%. Accuracy is ±5 RH. Temperature range is from 23 to 131°F and -5 to 55°C. Accuracy is ±1°C. Temperature displayed to 0.1 degree. Humidity range is 10 to 98% RH. A clock displays the time to the minute in either am/pm or 24-hour time. Calendar shows month and date. Surprisingly accurate forecasting indicators show weather conditions for the next 24-hours using symbols for sunny, cloudy, rainy, and partly cloudy. Temperature and humidity are updated every 9 seconds, barometric pressure every 15 minutes. Switches permit setting in Fahrenheit/Celsius and inHg/mbars. Unit is 7-1/4 x 5-1/4 x 1 inches. Weighs 10 oz. Supplied with stand, wall-mount and batteries.