I have an older version 1999 of the ElectriCalc Pro calculator. They have an upgrade kit for 2005. I don't see how to install it, unless I have to pull the back cover off. But it doesn't look like it would fit inside. $39.95 upgrade kit. $89.95 new calculator 2005
The Golden Rule - "The man with the gold makes the rule"
What could have changed in what your calculator has in it? Tables haven't changed have they? None of the other calcs for VD, or amperage have changed have they? So what is different in the calculator for '99, and the up-grade chip?
Mark Heller "Well - I oughta....." -Jackie Gleason