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| Exactus |
| Model |
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Sterling Mini-Add |
| Maker |
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| Origin |
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England |
| Date |
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| Serial |
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| A small, pocket sized
calculator. Like the Addiator, a stylus is
used to move the numbers up or down. However,
to change between addition and subtraction
a hinged plate is raised or lowered rather
than turning the Exactus over. |
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| To add, the number is
pulled down to the bottom if it is silver
or up, round to the left and down if it is
red. To subtract, the number is pulled to
the top if red or down, then round to the
left and up if silver. The small size and
the hinged flap make the Exactus fiddly. |
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| I find it easy to make
a mistake on the Exactus while the Addiators
are much more usable. |
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