At which points in the brewing process should I use the pH testing kits? I ordered mine from from Micro Essential Labs' website and they have everything I could have possibly needed when it comes to pH products, but I need some help now that I've got them!
You can use the pH tester to verify that the acidity of your mash water is correct. It is also useful to test your wort if your fermentation is slow taking off. You should see a drop in pH and if you don't, you've got problems.