I bought this to help make my first sour. For the price its a good deal. However it is not an exact tool. It will give you a PH reading but not as accurate as I would have liked. I had to take an educated guess if my PH hit 3.5. For the price its a good start.
Great first test for target pH. Broad scale tells you if you're close to the beer 5.2-5.7 range for mash and sparge water. The colors are very different for the ranges to make it easy.