Stupid process question but here goes.
When testing and adding the reagent (titrating) where is your end point?
Using the speedstir is frequently see the first hint of color change then a small but easily noticeable change, then one drop or more and a full color change.
I'm tempted to take the middle ground. Drop----tiny and slowly expanding faint color change then one drop or more gets me an easily noticeable color change that is still light but larger.
I don't my old eyes could be that precise without the speedstir.
any input appreciated.