Casio VL-80 Operation Manual page 6

* If battery goes bad take them out at once and replace them
to avoid damage to thé instrument.
To clean thé instrument, use a soft, dry cloth or slightly damp
cloth with neutral détergent to wipe it off. Never use thinner,
benzine type solvents or alcohol for cleaning.
When using as a calculator be sure to check that thé key de-
pressed and thé number indicated in thé display are in agree-
ment.
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