Why?  Because you can also buy a scam at Walgreens?.  The level of
urine/saliva pH varies widely as a function of daily diet, and activity and
is not a particularly useful diagnostic. It's a great money-making tool in
the hands of those who are selling those kits, and the people who are
selling supplements to magically "correct" the supposed problems that were
revealed by the test.

pH testing of the blood is a valid tool when trying to diagnose frank
acidosis disorders, but in the hands of a doctor who can actually interpret
the results--certainly not by someone who is trying to "balance" his
body--whatever that means.