Technically speaking, the choice of 7ml and 3ml is what it\'s supposed to be. It\'s working off of a percentage ratio on each product.
Going by 7 dabs or drops with the different products may get you close....but not exact. In many cases, the products have different thicknesses making the drops different sizes depending on how they come out of the dropper. Also, in terms of dabs...the sizes of each bottle\'s opening is different, so the dabs won\'t always be the same size either.
To be exact, you\'d be best to get a calibrated syringe or other measuring device to make sure you\'re mix ratios are accurate.
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