Casio WSD-F20X User Manual page 73

Metal Components
Failure to clean dirt from metal components can lead to formation of rust,
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even if components are stainless steel or plated. If metal components
exposed to sweat or water, wipe thoroughly with a soft, absorbent cloth and
then place the watch in a well-ventilated location to dry.
Use a soft toothbrush or similar tool to scrub the metal with a weak solution
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of water and a mild neutral detergent, or with soapy water. Next, rinse with
water to remove all remaining detergent and then wipe dry with a soft
absorbent cloth. When washing the band, wrap the watch case with kitchen
plastic wrap so it does not come into contact with the detergent or soap.
Liquid Crystal Display
Display figures may be difficult to read when viewed from an angle.
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The LCD of this watch has flat bottom, and so it is not round. Because of
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this using a watch face that is designed for a round display may result in
some part of the face being cut off.
The liquid crystal panel of this watch uses high-precision technology that
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provides a pixel yield in excess of 99.99%. This means that some very small
number of pixels may not light or may remain lit at all times. This is due to
the characteristics of the liquid crystal panel, and does not indicate
malfunction.
EN-72