Two in one: the official QP IIIx/fx from Calculated Industries for your Android device includes two models: #3415 and #3430 (QP IIIfx). All the Power and Versatility of the QP IIIx/IIIfx calculator – on your Android device. • Email loan worksheets to your clients from your Android Smartphone • No learning curve -- just one powerful, easy-to-use mortgage loan calculator app • Full User's Guide built in as well as ability to press and hold a key for specific help Need quick, accurate soluti