MINE WAS A DUD
I have a water ionizer.  This product registered the same PH level regardless of what water I was testing.<br /> I ended up purchasing another tester from another company; and behold, all the different water I was testing registered appropriately.  I am glad I did not just go with this product but rather purchased another tester from another company because I could have thought my equipment was faulty.  I am glad I read the reviews for this product albeit after the fact.
Rating: 1 stars