scrap! Do not buy! That does not work. I bought it thinking the 5 star guy was right and he knew what he was talking about! But unfortunately no. It was reporting high chlorine in one of my pools that had been zeroed for over a month and calibrating that junk had no effect on the high chlorine reading. If you're listening to that guy saying we're all stupid and obviously don't know how to use it, please leave a comment after you personally know it's a piece of junk so people don't get sucked off by it anymore to buy from this garbage!
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