Skip to content

CASIO

User´s Guide

Find

Precautions

Be sure to read the following safety precautions before using the calculator.

Safety Precautions

  • Danger

    Indicates something that creates the major risk of death or serious personal injury.

Button Type and Coin Type Battery Precautions (fx-991MS only)

  • Take care to ensure that a battery will not be swallowed accidentally.
    Particular care is required to keep batteries away from children.

Should a battery be swallowed accidentally or if there is a possibility that a battery has been swallowed, immediately contact a physician.
Swallowing a battery can result in chemical burns, mucosal tissue penetration, and other serious problems that create the risk of death.

  • Warning

    Indicates something that creates the risk of death or serious personal injury.

Display Screen

  • Do not press the LCD or subject it to strong impact.

Doing so can cause the LCD glass to crack, creating the risk of personal injury.

  • Should the LCD become cracked, never touch any of the liquid inside.

LCD liquid getting on the skin creates the risk of skin irritation.
Should LCD liquid get into your mouth, immediately rinse your mouth out and contact your physician.
Should LCD liquid get in your eyes or on your skin, rinse with clean water and then contact your physician.

Battery Precautions

  • Should fluid leaking from a battery get on your skin or clothing, immediately rinse it off with clean water.

Battery fluid getting into the eyes creates the risk of eyesight loss, etc. Rinse the eyes and then immediately contact a physician.

  • Caution

    Indicates something that creates the risk of minor personal injury or physical damage.

Observe the precautions below. Failure to do so can cause a battery to rupture, creating the risk of fire, personal injury, and soiling of nearby objects by leaking fluid.

  • Do not try to take a battery apart and never allow a battery to become shorted.

    Do not charge a non-rechargeable battery.

    Do not expose a battery to heat or throw it into fire.

  • Use only the specified type of battery.

    Load a battery with its poles (plus (+) and minus (–)) facing correctly.

    Replace the battery as soon as possible after it goes dead.

  • Battery Precautions

  • Observe the precautions below. Failure to do so can cause the battery to explode or leak flammable liquid or gas.

Use only the type of battery that is specified for this product.

Do not burn a battery or dispose of it in an incinerator, or by mechanical crushing or cutting.

Do not subject a battery to excessively high or low temperatures during use, storage, or transport.

Do not subject a battery to excessively low barometric pressure during use, storage, or transport.

How to Replace the Battery

The procedure for replacing the battery varies depending on the product and region.

Product name Battery type Region of purchase Battery replacement method
fx-991MS Built-in solar cell;
button battery LR44 × 1		 US and Canada For safety reasons, please do not replace the battery yourself.
Always leave battery replacement up to an authorized CASIO service center.
Other than US and Canada Please replace the battery yourself.
fx-100MS
fx-570MS		 AAA-size battery R03 (UM-4) All regions Please replace the battery yourself.

Handling Precautions

Even if the calculator is operating normally, replace the battery according to the schedule shown below. Continued use after the specified number of years may result in abnormal operation. Replace the battery immediately after display figures become dim.

fx-100MS/fx-570MS: Every two years

fx-991MS: Every three years

A dead battery can leak, causing damage to and malfunction of the calculator. Never leave a dead battery in the calculator.

The battery that comes with the calculator is for factory testing, and it discharges slightly during shipment and storage. Because of these reasons, its battery life may be shorter than normal.

Do not use a nickel-based primary battery with this product. Incompatibility between such batteries and product specifications can result in shorter battery life and product malfunction.

Avoid use and storage of the calculator in areas subjected to temperature extremes, and large amounts of humidity and dust.

Do not subject the calculator to excessive impact, pressure, or bending.

Never try to take the calculator apart.

Use a soft, dry cloth to clean the exterior of the calculator.

Whenever discarding the calculator or batteries, be sure to do so in accordance with the laws and regulations in your particular area.

print this page
Top of page