Hi Bill,
Your post has reminded me of a question that has been bugging me since I started my own DIY journey; how do you reconcile the fluid/volume difference of any/various needle/tip diameters and lengths? (Especially something as large as the item you cited in the above quote.)
I have read all of your blogs, and as many of your "tutoring" posts as I can find, as your logic and methodology makes sense to me. I like the simplicity of your 100DT method for test batches. But I don't find it practical for my usual 15-30 milliliter "normal" batches.
I'm 53 years old with crappy eyes and found the syringes difficult to read so I looked for an alternative. I settled on using pipettes (the glass ones with a manual pump as opposed to the disposable plastic ones with the squeeze bulb integrated on top). I like having the graduations spread further apart and the greater accuracy they provide for smaller volumes (the 1 ml. pipette gives me 1/100 ml. control).
Of course, they are not without their own possibility of error, there is always
some(?) amount left clinging to the walls of the pipette (the greater the viscosity <i.e. VG> the more residual clinging).
I usually mix in batches of 15 to 30 ml. and have never mixed more than 60 ml.. I am looking for the easiest, most repeatable (accurate) method, to make my recipes. I would appreciate any thoughts, experience, observations you might have.
Thank you for all your controbutions you have made here on ECF, and more personally, to my own DIY journey!