For more reliable results and a greater ease of manipulation, the plastic strips for pH values between 5.5 and 9.0 are non bleeding and rigid. You can leave them to soak longer than a paper strip without the fear of contaminating the tested solution or of sinking the paper.
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Plastic box of 100 units
Steps of the colorimetric scale: every 0.5
Number of reading zones: 2
pH value scale: 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9