calculator.org

the calculator home page

Imperial 81SR

The Imperial 81SR is a scientific calculator with 8 digits precision and algebraic logic. It has 16 functions, 19 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAAA.

Facts at a glance:

FeatureValue
TypeScientific
Functions16
Keys19
Precision8
LogicAlgebraic
Display typeVFD
Length95mm
Width65mm
Thickness23mm
Power Source4xAAA
Year introduced1975

Replacements:

If you have an Imperial 81SR that is no longer working, you can first try replacing the 4xAAA batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current model as a replacement:

See other calculators by Imperial