The Planted Tank Forum - View Single Post - ~Explanation of how a drop checker works~
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Old 03-05-2012, 08:27 PM   #22
musicjeremy
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I have been using the RedSea drop checker which does not come with a reference solution. My tap water is about 3-4 degrees KH so I have just been using tap water.

Should I get a new drop checker which actually comes with reference solution?
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