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Even without being used/abused they ' expire' ? Did not know that.. have three heads with unit... checked two of them..but could just be that old ... I feel like I ought to invest in one I can check when I buy it .. meaning CL and local ... rather than add to the cost of this one with no way to check the box part of this one... it did come with battery stuff leaking.. which I rinsed with distilled water and dried out... light does come on.... if I could find out what it is supposed to be providing to the metal arm I would check that out...there are disadvantages of being (too) cheap sometimes...
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