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Berkey 350 (Keystone)

Berkey 350
Image: Joe Haupt, CC BY-SA 2.0

The Berkey 350 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 5 functions, 18 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAA. The calculator was manufactured in USA.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions5
Keys18
Precision8
LogicAlgebraic
Display typeVFD
Length133mm
Width83mm
Power Source4xAA
CountryUSA
Year introduced1974
Year discontinued1974

Replacements:

If you have a Berkey 350 that is no longer working, you can first try replacing the 4xAA batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements:

See other calculators by Berkey