With distinct color PH scale for result comparisons. The test strip color changes must be matched with 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 to measure and inspect water quality, urine, saliva, soil, alkaline diet, aquariums etc. 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 Total length:. 500x1.3mm PH range: 0-14 Usage: Take out a test paper. The 2 color blocks all immersed in liquid. After 1 seconds to take out, in contrast to color of color reading value in . Note:Due to different production batches, there are differences in printing/appearance, which does not affect use. Colour:As Shown Material:Plastic Package Contents: 1 * PH Meter Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.