Small batch testers, save your inventory, prevent the heartache of dumping large quantities of unvapeable failures down the drain, or trying to salvage those "unvapeables" by doctoring. They also keep any aging requirements to a minimum (big batches can require more time).Thank you for the detailed reply. I will certainly consider testing in smaller batches.
vaping (especially DIY) is very personal, and one size rarely fits all. Remove some of the pressure, of getting a "great" recipe, by keeping them small until you get it the way you like it. Then you can mix bigger batches.