The pH paper helps you keep your body healthy by testing many common substances, including hydrated soap, lemon juice, milk, liquid detergent, saliva, urine, etc. The scale indicates from 1 to 14: 1 - 3 indicates very acidic substance, 4 - 6 indicates acidic substance, 7 indicates neutral, 8 - 11 indicates alkalinity, 12 - 14 indicates very high level of alkalinity Package: PH color chart 1-14 in each pack, total 240pcs of 3 pack Test strip color changes should match pH scale color chart within about 15 seconds. Dimensions: Approximate pack size 70 x 45mm Extra large measuring range: 1-14 Results in seconds Precise color matching Package: 4 pcs Dimensions: 70 x 45mm Note: This does not include other things, the color is based on the first picture, and other pictures only show the effect Due differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thanks!