Truck diadance: Urine is applied to the color block, then the color card, find the closest color, to derive an alkalinity. Test amniotic fluid, principle (the average person's vaginal secretion is acidic, and amniotic fluid is alkaline, acid alkalinity 7 or more) use sterilized cotton to pick vaginal secretions, apply it to the color block, then the color card, find the closest color, Draw a sour alkalin, if the color of no color or 6 or less is not amniotic fluid, 7 or more colors are amniotic fluid.
eBay