In the 1960s and 1970s, biorhythms were a fashionable "scientific" way of calculating one's good and bad days, relationship compatibility, and more based on birth dates. The 1979 Kosmos 2 was a state-of-the-art handheld biorhythm tool. Because it cannot handle any date after 1999, it is no longer able to calculate biorhythms for individual days, but it can measure the compatibility between any two people born prior to 2000. Also functions as a regular calculator. Takes two AA batteries (included). Includes 30-page photocopied manual with complete instructions. Calculator in black leather case embossed KOSMOS 2 measures approx. 5" x 2.75" (13.5cm x 7.5cm). In excellent vintage condition.
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