Digital Psychrometric Calculator. One individual caculator. Makes critical moisture calculations easy and fast Now you can make the scientific calculations you need for water damage restoration with speed, precision, and ease. The Digital Psychrometric/Dehumidifier Calculator from Dri-Eaz helps you find fast answers to make the best on-the-job decisions. Our water restoration techncians love these handy little caculators and so do the insurance adjusters.