Take care never to leave the calculator where it might be splashed by water or exposed to large amounts of humidity or dust. Such conditions can damage internal cir- cuitry.

•Never drop the calculator or otherwise subject it to strong impact.•Never twist or bend the calculator.

Avoid carrying the calculator in the pocket of your trou- sers or other tight-fitting clothing where it might be sub- jected to twisting or bending.

•Never try to take the calculator apart.

•Never press the keys of the calculator with a ball- point pen or other pointed object.

•Use a soft, dry cloth to clean the exterior of the cal- culator.

If the calculator becomes very dirty, wipe it off with a cloth moistened in a weak solution of water and a mild neutral household detergent. Wring out all excess mois- ture before wiping the calculator. Never use thinner, ben- zene or other volatile agents to clean the calculator. Do- ing so can remove printed markings and can damage the case.

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