Calcu-pen
Calcu-pen
Distinctive features: The first calculator in a ball-point pen.
Technical details:
Display is 8 digits, red LED.
4-function, %.
1.5v (1x N).
160 mm x 15 mm (6.3" x 0.6").
About 1975.
Made in Japan.
The buttons are 4-way switches. To operate, a finger is placed on a button and moved sideways in the direction of the number or operation required.
Click here to see the article "Unusual Calculators The Calcu-pen" by Guy Ball in the "Collecting Calculators" section of this site.
By 1975 the electronics required for a calculator had shrunk so much that it could be fitted into a, slightly bulbous, ball-point pen.
