1、QUICK TESTING: Place a drop of the liquid to be measured on the PH test strip and the result will be displayed after half a second. 2、MONITORING WATER QUALITY: The measurement of water samples is one of the commonly used indicators for water quality testing. The pH value required for drinking water is generally between 6.5 and 8. 3、MAKEUP MEASUREMENT: Skin is weakly acidic and long term use of alkaline cosmetics tends to dry out the skin, so the cosmetic is best for cosmetics to have a pH value between 4 and 6. 4、SOIL PH MEASUREMENT: This test strip can also be used in agriculture, forestry and construction to measure the pH of soils, such as soil nutrients for planting flowers and plants. 5、100 STRIPS: A total of 100 PH test strips in a box will meet your long term measurement needs and water quality monitoring requirements.