HP 10s User Manual page 7

@ When battery power is very low, the calculator's
memory may become corrupt or be lost
completely. To avoid loss of important
information, keep a copy of it elsewhere.
@ Avoid storing or using the calculator under
extreme temperature 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, the calculator should not be directly
exposed to the sun or placed 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 case of calculator 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.