Patent ID: 7124933

Claim:
An electronic calculator apparatus for converting between bushel measures of a selected crop product and weight measures of the selected crop product, the apparatus comprising: a microprocessor; a keyboard comprising a numerical portion, a crop product portion, and a conversion portion operative to transmit to the microprocessor respective numerical, crop product, and conversion data inputs selected by a user; wherein the microprocessor is programmed with known arithmetical relationships between bushel measures of selected crop products and corresponding weight measures of the selected crop products and is operative to receive the numerical, crop product, and conversion data inputs and to provide a data output corresponding to a desired conversion between bushel measures and weight measures; and a display coupled to the microprocessor and operative to display the data inputs and data output to a user; wherein the microprocessor, keyboard, and display are integrated to form a handheld electronic calculator, and wherein the numerical and crop product portions of the keyboard utilize the same keys, and wherein the keyboard further comprises a function selector key operative to select a numerical function or a crop product function for the keys.