This pH tester kit allows you to accurately test the pH of various substances including food, aquarium/water, urine, soil, etc. Approximate pack size 70 x45 mm PH 1-14 Color in each pack Litmus Paper Test Brounds Change Color within 15 seconds To be matched with the color of pH color, the scales are as follows:- 1-3 indicates very high acidic substance 4-6 indicates acidic substance 7 indicates neutral 8 -11 indicates a substance alkaline 12-14 indicates a very high level of alkalinity