HP 300s Scientific Calculator - Manual (Page 10)

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2. After using the calculator, slide the unit out of the cover as
shown in step 2. To use the protective case, slide it over
the keyboard side of the unit.
Turning Power On and Off
• Press  to turn on the calculator
• Press   (OFF) to turn off the calculator.
Adjusting Display Contrast
  (SETUP)   (  CONT  )
Displays the contrast adjustment screen. Use  and  to
adjust display contrast, and then press  .
You can also adjust contrast using  and  while the
mode menu (appears when you press  ) is displayed.
IMPORTANT: If adjusting display contrast does not improve
display readability, battery power may be low. Replace the
battery.