Stonex R20 – User Manual 79
15.3. Cleaning and Drying
Surface of Objective and Eyepiece
• Do not touch the optical surfaces with your hands or other hard objects at any time.
• Blow the dust off the lens and prisms before cleaning.
• For cleaning use only a clean soft lens wiping cloth, lens paper, cotton swabs etc. If necessary, use pure
water or pure alcohol to moisten them.
Do not use other liquids as they may damage the instrument parts。
Fogging of Glass Surface
If the temperature of the lens is lower than the ambient temperature, then it will tend to fog up. Generally, do not
wipe, it can be left for a period of time, so that it slowly adapts to the surrounding temperature, the fog will generally
disappear on its own.
Drying the Instrument
If the instrument or accessory has been slightly exposed to moisture or water, it can be left in a dry environment at
a temperature not exceeding 40 °C for a period of time. After complete drying, the surface should be cleaned.
Always place the instrument in its case and close the cover when not in use in the field.
Cables，Plugs and Charger
Keep clean and dry at all times. When not in use, can wipe with a clean, dry cloth.
Do not use water or wiping tools with water to clean electrical accessories.
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