I use Alkamax, the kind that comes in a roll you tear a strip from. I notice that the urine changes the color to different shades, darker shades, as I wait a few seconds. When I called the Alkamax help number the lady said "Wait 2 seconds." But I wonder if she knew what she was talking about. It seems to take about 4 seconds to get to its darkest color and I'm guessing that's due to deeper saturation from the urine on it. What do you think?
Also, different types of light give different readings! Light from a window in the daylight gives one reading and artificial light gives another. Sigh.