Seiko Group ER3500 - Manual (Page 70)

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Calculator
Keys and their Functions
1. Selects Calculator and Unit Converters.
2. Clears last entry with one press, clears all with two
presses.
3. 1 ~ 0 Number input keys.
4. +, –, x,
÷
Mathematical function keys.
5. MC Clears memory.
6. MR Recalls number from memory.
7. M+ Enters number into memory.
8. M- Subtracts number from memory.
9. +/– Changes sign of number.
10. % Percentage key.
* The number stored in the memory is held when the calculation is
changed, the mode is switched or the power is turned off.