Pure Lab Vitamins - AlkaPure PH Test Strips - 100 Strips - NPN: 00000000 -- Physiological pH paper for salivary and urinary pH testing. pH 5.5 to 8.0 How to test your pH To determine your baseline perform the test twice a day for at least 7 consecutive days. Pure Lab recommends saliva or urine for testing. Saliva is a better indicator of the acidity/alkalinity of the tissues. At 10:00am: - Tear off a 1" strip of paper from the roll. - Milk the saliva in your mouth but swallow the first collection. - Repeat and use saliva from second collection to perform the test (spit into a small cup). - Allow 5-10 seconds for colour to finish changing. - Compare strip to colour chart provided. Repeat at 3:00pm. After 7 days, add your values then divide the total by the number of tests you have performed. This will give you your average pH.