Manufacturer Kosmos was responsible for a line of handheld biorhythm calculators, of which the Astro was the most advanced. There's an in-depth video review and manual read at the Calculator Review, and a tech breakdown at the Datamath Calculator Museum. It turns out vintage calculators are alive and well on the web!
Click here for the complete manual. The Astro was also available at Radio Shack:
From Fate, Volume 33 - Number 2, February 1980.
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