HP 300s Scientific Calculator - Manual (Page 9)

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Disposing of the Calculator
• Do not dispose of this calculator in an incinerator. It might
explode and cause injury or fire.
Other Precautions
• Before using this calculator for the first time, press the % key.
• The battery may lose some charge between the time the
calculator leaves the factory and the time when it is purchased.
Thus the original battery may not last as long as a new battery.
• When battery power is very low, the calculator’s memory may
become corrupted or be lost completely. To avoid loss of
important information, keep a copy of it elsewhere.
• Avoid storing or using the calculator under extreme conditions.
• Low temperature will slow the calculator's response time, cause
the display to appear incomplete, and shorten the life of the
battery. In addition, do not directly expose the calculator to the
sun or place near a heater. High temperature may cause the
casing to fade, distort the casing, or damage the internal circuitry.
• Avoid storing or using the calculator in damp conditions or when
there is high humidity or excessive dust. Doing so will damage
the internal circuitry.
• Do not drop the calculator or allow it to be subjected to extreme
force.
• Do not twist, bend or otherwise distort the calculator.
• Note: Carrying the calculator in a pocket could cause it to twist or
bend.
• Do not use a pen or other pointed object to press the calculator’s
keys.
• Use a soft, dry cloth to clean the calculator. Opening the
calculator casing voids the warranty.
• If the calculator is very dirty, a neutral household cleanser diluted
in water can be used to clean it. Dip a cloth in the solution and
wring it out before applying it to the calculator. Do not use
benzine, a diluting agent or any other volatile solvent to clean the
calculator. Doing so may damage the casing and the keys.
Before Using the Calculator
Using the Protective Hard Case
1. Before using the calculator, slide the unit out of the protec-
tive case as shown in step 1.