Paper Size: 45mm x 7mm (L x W) Packing Content: 2 X Pack(160 pH Strips) | PH 1-14 color chart in each pack | Under normal circumstances, the solution of the tested paper will produce color changes one second after contact with the test paper | Different pH content discoloration range is different, by comparing the color card ratio: the smaller the number, the stronger the acidity, the larger the value, the stronger the alkalinity. | Ph test paper can be commonly used to test many commonly used substances, including urine, sweat, moisturizing soap, lemon juice, milk, liquid detergent, moist soil, and so on.