Calculated Industries 3420 User Guide - Manual (Page 7)

6 — Q UALIFIER P LUS ® III X
KEY DEFINITIONS
Basic Operation Keys
O Turns all power off. The memory and most financial
registers are cleared.
o If calculator is off, turns power on. If calculator is on,
a single press clears the last entry while a second
press in succession clears non-permanent entries.
+ – x Arithmetic operation keys.
÷ =
0
– 9 Keys used for entering numbers.
) Triple-zero key (saves time when entering 000
values).
b Backspace key (deletes incorrect entries one digit at
a time).
• Decimal point.
% Percent — Four-function (+, –, x, ÷) percent key.
See page 22 for examples.
µ Memory — Adds the displayed number to the inde-
pendent cumulative memory. Pressing s µ
(M–) will subtract the displayed value from the
cumulative memory. Pressing
® µ recalls and
displays the memory contents. Pressing ® ®
clears the memory. See page 19 for details.
® Recall — Recalls and displays the contents of the
financial registers (e.g., ® ˆ ). Also used for
Memory functions.
s Used to set the number of displayed decimal places
(see section on Decimal Place Selection, page 15).
Also works with other keys to set or activate addi-
tional functions. (Think of it as a “shift” key on a
typewriter.) It will perform the function printed above
the key on the calculator's face.
s – Change Sign — Changes the sign of the displayed
value from positive to negative or vice versa.
GETTING STARTED
3420UG-E-A 7/2/04 9:06 AM Page 6