7 in 1: The test strip can be used for rapid analysis and detection, of Nitrate, Nitrite, pH, Chlorine, Total Hardness, Total Alkalinity, Total Chlorine Practical in Use: Wells and pipes or swimming pools can be easily contaminated. It is recommended to use this test strip frequently. Measure your pH accurately to show alkaline by using the strip. Ensure your body and water are safe. Easy to Use: Immerse the test strip in water for 2 seconds, hold it in the air for about 60 seconds, and then adjust the color on the back of the bottle to get a reading to comfortably test your pH at home. Economical and Applicable: Water quality should be tested weekly. One pack of our test strips includes 100 test strips. It is used for water quality testing of drinking water, household taps, well water, freshwater, fish tanks, swimming pools and more. Portable Design: There are 100 test strips in each bottle. It is compact and easy to carry. The appearance of the storage bin silk screen batch number may vary from batch to batch, but it will not affect the use Colour:White Material:pet film + filter paper Package Contents: 100pcs/bottle PH Test Strips Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.