How It WorksTest Your Acidity or Alkalinity with NSP pH Strips.It is important for you to test your pH level to determine if your body’s pH needs addressing. By using Nature’s Sunshine pH test strips, you can determine your pH factor quickly and easily in the privacy of your own home. If you urinary pH fluctuates between 6.0 -6.4 in the morning and 6.4 – 7.0 in the evening, your body is functioning within the normal range. If your saliva stays between 6.4 and 6.8 all day, your body is functioning within the normal range.