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DO NOT wipe the lens with anything other than lens cloth.
DO NOT disassemble the device which is calibrated by high precise instrument. Please
send it to a professional maintenance department when the device gets problems.
DO NOT touch the lens by finger in order to protect the coating on lens.
Charge the device when the icon shows to avoid bigger accuracy under low
power condition.
DO NOT carry the device with collision or weight.
DO NOT make the device in baking or corrosion environment.
DO NOT operate the device aiming to the sun or strong light source, which may
damage the photosensor.
DO NOT store the device under sunlight, dusty or temperature-abrupt environment.
It should be kept in a dry, cool and ventilated place.
