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Message: <blockquote data-quote="bombastinator" data-source="post: 23713139" data-attributes="member: 43994">Two ways.  One is DIY (and yes I do that.  It’s simpler as well as cheaper) if you don’t DIY you can do it with an an empty bottle, a scale, a bottle of zero, and a tile of whatever strength.  Stuff is more accurate when mixed by weight on something accurate to a tenth gram.  If you’ve got a triple beam scale that will do it, or you can buy a little calibratable electronic one for 1/10th the price on ebay.The scale I have has X.xxx for a readout but I don’t trust the third X making it effectively X.xits also in theory doable without a scale, using 3 drops as a ml.  I’m not sure how accurate that is though and it can get kind of monotonous counting drops.</blockquote>

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