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does anyone know what the smallest drop checker is?

Fat Guy I would make it but I don't have a scale that accurate, nor KH tester...
you don't need a kh tester. you don't even need a scale if you search online for different ways of measuring sodium bicarbonate to make a 4dkh solution....

or just pay somebody to ship you water with baking soda added to it. If you go this route, i suggest you check out green leaf aquarium for the purchase. they are very reliable. I would stay away from ebay on this one.
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