This tool show a psychrometric (Humid air) chart. Let mouse integration to specify state or input pair parameter with common combinations. Let too save chart to file
Line, limits and linestyles can be configurated in main program preferences.
By default, the chart use the ASHRAE Reference Handbook recomendation, using the ideal gas equation of state. If coolprop external library is available let choose it in preferences, more accuracy because use the virial EoS recomended in ASHRAE RP-1485. The calculation could be fairly slow (specially with coolprop), anyway the tool save data in disk so the next loads are almost instantaneous.