Electronic engineers and enthusiasts seeking a comprehensive collection of electronics calculators and fundamental electronics reference materials will want to take a closer look at a new iPad application called Electronic Toolbox HD. Based on a previous release of the utility for the iPhone, Electronic Toolbox HD contains over 20 different categories from a resistor color code calculator to a comprehensive (though not exhaustive) list of integrated circuits (ICs) and their corresponding chip diagrams. The application covers a spectrum of electronics features: