Manual Humidifier Control. Tap Humidifier under the humidity tab to access the humidifier screen. To control your humidifier’s status, tap On/Off. Tap the arrows on the Humidifier Control icon to set the desired indoor humidity level. You should consult the Suggested Indoor Relative Humidity Chart at the bottom of the screen when determining what level to set your relative humidity.
Margaret Roach has been writing about gardening for many years. She has a 2.3-acre garden in Massachusetts and shares helpful info like this VEGETABLE-STORAGE chart from the University of Wisconsin on her blog. Very helpful!
The psychrometric chart displays several quantities: dry bulb temperature, dew point temperature, wet bulb temperature, humidity ratio, specific enthalpy, specific volume, relative humidity, and water vapor pressure being the top nine. Also, barometric pressure (or equivalently, altitude) is given.
Psychrometrics Chart, can be used to find change in relative humidity based on temperature change. Better PDF at http://www.uigi.com/UIGI_IP.PDF
The Kestrel 4200 Pocket Air Flow Tracker monitors and reports an extensive list of environmental parameters — from temperature (Celsius or Fahrenheit) to barometric pressure, altitude, relative humidity, and more**. Like all Kestrel 4000-series meters, the Kestrel 4200 also stores that information and even charts up to 2000 data points for later analysis. The Kestrel 4200 has all available monitoring functions of the Kestrel 4000, plus Humidity Ratio and Air flow (CFM).
Graph of the dependence of the dew point upon air temperature for several levels of relative humidity.