.Looks to me like depending on the source, the vendor either sends you one of three different sized scoops or one of three different specific gravity/density of product (grain size maybe?).
Either way, you need a set of good scales IMHO
hmmm seems like Cindy uses the pinch of this and a pinch of that method.... must not be too critical
But Id borrow a good set of scales from someone... and weigh out what my scoop held and be done with it.