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Changes color from red to blue when conditions change from acidic to alkaline. Litmus paper is the best-known indicator paper.
| Platform | Products for pH determination |
| Parameter | pH |
| Detection limit | pH - 5.0–8.0 |
| Color change | pH - red → blue |
| Length | 70 mm |
| Width | 10 mm |
| Shelf life (from production) | 3 Years |
| Storage temperature | 4−30 °C |
| Scope of delivery | 100 test papers in a booklet |
| Hazardous material | No |
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