Specification: Brand new Total length: approx. 5m PH range: 0-14 Feature: With distinct color PH scale for result comparisons. The test strip color changes must be matched with the pH scale color chart within about 15 seconds. Quick and easy to use. Provides reliable and accurate pH readings. Easy to carry. Appropriate for testing alkaline or acid level of any liquid. Great product to have in every lab and at home to measure and inspect water quality, urine, saliva, soil, alkaline diet, aquariums etc. Great for science education. Usage: Take out a test paper. The 2 color blocks all immersed in the liquid. After 1 seconds to take out, in contrast to the color of the color reading value in 30 seconds. Scale Reads From 0 to 14: 0 - 3 indicates a very acidic substance 4 - 6 indicates an acidic substance 7 indicates neutral 8 - 11 indicates alkalinity 12 - 14 indicates a very high level of alkalinity Package included: 1 x PH Test Paper Note: Can not indicate the Acid or alkali solution when its density was lower than 0.01 percent . Keep dry for the rest paper. Please allow 0-1cm errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.