La Crosse Technology WS-9121 - Manual (Page 37)

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9 When cleaning the display and casings, use a soft damp cloth only.
Do not use solvents or scouring agents as they may mark the LCD
and casings.
9 Do not submerge the units in water. Furthermore, fix all parts in
place where the units are adequately protected against moisture
and rain.
9 Immediately remove all low powered batteries to avoid leakage and
damage. Replace only with new batteries of the recommended
type.
9 Do not make any repair attempts to the unit. Return them to their
original point of purchase for repair by a qualified engineer.