A convenient, precise and powerful tool for HVAC&R engineers. This psychrometric chart is perfectly consistent with all ASHRAE charts of No.1~7(SI Units) and No.1~5(IP Units). Features include: High precision calculation; Metric(SI) and English(IP) units support; Convenient chart operating; Powerful process calculating; Include thermal and adiabatic effect calculation for air/liquid duct. Full functional trial, free upgrade.