Hewlett-Packard HP 22 (Woodstock TURNIP)

Hewlett-Packard HP 22
Image: Wikimedia CC BY-SA 3.0
The Hewlett-Packard HP 22 is a scientific calculator with 12 digits precision and algebraic logic. It has 39 functions, 30 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 2xAA.

Facts at a glance:

Feature Value
Type: Scientific
Functions: 39
Keys: 30
Precision: 12
Logic: Algebraic
Display type: LED
Length: 129mm
Width: 67mm
Thickness: 29mm
Weight: 170g
Power Source: 2xAA
Year introduced: 1975
YearDiscontinued: 1978

See other calculators by Hewlett-Packard