Exhibits At the Museum

This Day in History

      January 2015
Today: November 29, 2015
the HP-35

January 4, 1972

Hewlett-Packard Introduces the HP-35

Hewlett-Packard introduces the HP-35, the first scientific handheld calculator and the final step in ending reliance on slide rules among scientists and students alike. The HP-35 was named for its 35 keys, weighed nine ounces, and sold for $395. One of the tests HP co-founder Dave Packard applied to the device was to throw it across his office and see if it still worked. It did.