Steren CAL-150 Instructivo De Uso página 175

Special Functions
Answer Function
The answer function saves the answer of the most recent
operation. Once an operation has been realized and the
button has been pressed, the answer will automatically
be stored.
In order to "recall" the saved value, press the button.
When this button is pressed, the LCD screen will display
if you press EXE the last obtained result will appear.
This result can be used in other operations afterwards.