Wide pH range: These pH meter test strips cover a range from 1 to 14, suitable for testing substances with varying acidity and alkalinity. Clear acid or alkaline display: The colour changing paper provides a straightforward indication of acid or alkali content. An acidic substance is indicated by a colour change at 4-6, while the alkalinity is indicated by a colour change at 8. Easy to use: Press the test strip on the object or liquid to be tested and compare the colour change with the included colour chart. The results are achieved within half a second for quick testing. Compact and portable: dimensions approx. 45mm x 7mm (L x W), making the strips compact and easy to carry. You can easily test the acidity of your subject at home, in the laboratory, or on the go. Use scenarios: - Home use: test drinking water, pool water, or other liquids for pH balance. - Lab or classroom: perform quick pH checks during experiments or demonstrations. - Gardening and hydroponics: monitor soil or nutrient solution pH to support plant health.