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the unit has been dropped or the enclosure damaged. E. the unit exhibits a marked change in performance or does not operate normally. 7. Periods of Nonuse – If the unit is to be left unused for an extended period of time, such as a month or longer, the batteries should be removed from the unit to prevent damage or corrosion. 8. Servicing – The user should not attempt to service the unit beyond those methods described in the user’s operating instructions. Service methods not covered in the operat