I would like to caution folks on comparing subjective characteristics like TH when making small batches of diluted juice. It would be difficult for each ingredient in a small 10 to 30ml 'batch' to be mixed with a precision of +/- 2% of final volume. Using appropriate labware this can be improved to about +/-1% for the various ingredients. In a laboratory environment and outstanding lab techniques ingredient accuracies in a small batch can be better than 0.1%, but not likely in the home lab. And surely not by using 'drops' for ANY ingredient.
24mg/ml diluted juice has 2.4% nicotine wt/v. To make a 10ml test batch of 24mg/ml to within 1% using 60mg/ml base would require 4.00ml +/- 0.04ml of base. How many drops is 0.04ml of VG based nic? of PG based nic? at what temperature? Won't happen.
The same thing goes for the other ingredients. Slight variations in the quantity of each ingredient may negate the validity of any comparative at-home tests.
This is fun. Realize the limitations.
I agree with you in principal, appreciate the reminder, and actually find it interesting to see the numbers put together like that. I have a somewhat different take on the matter though...
I typically use whatever I consider the smallest "reasonable" device to measure. In this case, I'm using a 5ml syringe if I'm measuring 4ml, and even a 10% error (
two measurement ticks on the syringe eek!) would "only" (making the same error in opposite directions on each batch) make a total of 4.8mg difference. Now, that I
might notice, but I think a +/-5% accuracy is much closer to what I'm able to easily attain, and that of course is only half the difference, or 2.4mg total difference (again, making the grossest error possible in opposing directions).
For me personally, 2.4mg is not something I could really detect, but I acknowledge some probably can.
I also admit I'm not the most perceptive test subject, so I openly advise anyone reading anything I write about TH/flavor/etc not to base any purchasing decisions on what I share! Take it collectively with other's feedback (or just ignore me altogether LOL).

@ the eyeballing remarks