They provide precise pH measurement of solutions by using single color change. pH measurement pads with different colors are chemically bounded to a cellulose fiber stick. This effectively protects the sample against contamination and enables measurements even in weakly buffered of strongly alkaline solutions. Fingers are protected from the test solution since the test pads are located at the extreme end of the strips. Since the pads do not bleed, pad colors do not interfere and mix with each other after the test and ensures reliable pH mesurement. After the measurement, the pH value can be found by matching the colors on the pads with the reference color chart printed at the back side of the box. 100 pieces strip is packed in a clear polystrene box for hygienic storage and for easy dispensing.

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