Hewlett-Packard HP 21 (Woodstock PUMPKIN)

Hewlett-Packard HP 21
The Hewlett-Packard HP 21 is a scientific calculator with 12 digits precision and algebraic logic. It has 25 functions, 30 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is Sealed NiCd battery pack.

Facts at a glance:

Feature Value
Type: Scientific
Functions: 25
Keys: 30
Precision: 12
Logic: Algebraic
Display type: LED
Length: 129mm
Width: 67mm
Thickness: 29mm
Weight: 170g
Power Consumption: 0.500W
Power Source: Sealed NiCd battery pack
Year introduced: 1975
YearDiscontinued: 1978
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See other calculators by Hewlett-Packard