For more reliable results and a greater ease of manipulation, the plastic strips for pH values between 9.5 and 13.0 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: 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 12.5 | 13