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I heard drops vary from types of syringes/droppers and it confuses me. [/COLOR]
Yes, Drop Sizes vary.
The Biggest Factors of Drop Size is how Big the Opening of the Dropper is and How Thick or Thin (the Viscosity of a Fluid) your e-liquid is.
A very Small Syringe Needle with a Very Thin Liquid, like Pure PG, will make a Very Small Drop. Where as a Jumbo Eye Dropper with a Thick Liquid, like Pure VG, will make a Relatively Large Drop.
But what is Crazy is that Drops are Actually a Very Accurate Measurement. Meaning, the Volume of a One Drop to Another, for the SAME Size Dropper and the SAME Viscosity Liquid, is Astonishingly Close.
The Key to using Drops in a Repeatable Recipe is you have to use the Same Size Dropper each time for an given Liquid.
All my recipes are worked up in Milliliters for Nicotine Base, PG and VG. And Drops for Flavoring. It works and is Repeatable because All My Flavorings came out of the Same type Size Dropper. All my Flavorings are kept in 10ml Glass Boston Dropper Bottles.