For more reliable results and a greater ease of manipulation, the plastic strips for pH values between 0.5 and 5.0 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: 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5