Clear blue digital OPK - reuse digital tester?

Ho
Hey! Just wondering what you have experieced. I have read we can't re-use the digital tester from these packs, but has anyone tried and found they work fine again? I have super irregular cycle and will be testing daily not just in my fertile window because I have no idea when that is... I read one woman thought it was just marketing/sales and the tester works fine even after the peak fertility. 

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