Calculating Things (3)

Calculating PDAs   Personal Digital Assistants (pda) were very populair in the nineties but became obsolete when the smart mobile phones were introduced.  Simple calculators were one 'application' in pdfs. It was possible however to download calculator apps that provided the user with sophisticated scientific calculators.

Calculating Matches   Hidden in a box of matches a small but functional electronic calculator, powered by sunlight.

Calculating Banknotes Hidden in a bundle of dollar bills small but functional electronic calculator, powered by sunlight.

Two displays To the right a Guilders-to-Euros converter with two identical displays: one for the vendor and one for the customer.

Euro to Guilders Converter (and v.v.) On top a small and cheap electronic Guilders-Euro calculator/converter. They were widely used during the introduction of the Euro in Holland. Beneath a paper slide rule-like conversion aid which was provied for free by BP as a useful gimmick.