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The pH strip is used for the determination of pH. The four colors on each strip correlate to. a pH range of 0 to 14. In the presence of fluid with normal pH (7.0), the strip willshow. the four colors of yellow-orange, orange, olive green, and yellow. In the presence of acidic. fluids (pH 5), the strip will display the four colors of yellow-orange, orange, tan and. yellow. The pH of gastric fluid is normally acidic.
Water Testing Strips like the AquaChek Test Strips can be used to test for individual chemicals or you can buy something like AquaChek Select 7 Way Test Strips or Yellow 4 Way Chlorine to make multiple tests at the same time.