* If battery goes bad take them out at once and replace themto avoid damage to thé instrument.To clean thé instrument, use a soft, dry cloth or slightly dampcloth 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.-4-