After using this test, I suggest getting testers that show the results in words. This test uses shades of pink. I don't understand why it uses shades of the same color but it's confusing and difficult to be certain that the test is being read correctly. It requires you to carefully match up the test with the instructions and make a determination whether one of the lines is a similar or darker shade of pink than the other line. This becomes annoying when you're testing for several days.