This is a low value request but it may pay off in the long run. The active ingredient field on the app asks for the imgredient as a percentage. The label of the potion could be in a form of grams per litre or micropascals per kg or some other unit that needs a tide chart and calculus to convert into a percentage. Can we have a common set of units to choose from so what is on the label can be entered verbatim. I dont know whether there are people mixing their own so how exhauative this could be. The origin of this request is an analogy from vineyard spray diaries where the operators start with say a 600l tank and add a set of ingredients each with their own coverage. By recording what is actually measured (i.e 30ml of this, 100g of that), both errors in intent and errors in application can be detected.