Feature:_x000D_1. There is a strong correlation between the pH of the body's internal environment and pH paper help you to maintain good healthy body by testing many usual everyday substances, including moisturized soap, lemon juice, milk, liquid detergent, moisturized soil, saliva, urine, sweat...etc _x000D_There is a strong correlation between the pH of the body's internal environment and pH paper help you to maintain good healthy body by testing many usual everyday substances, including moisturized soap, lemon juice, milk, liquid detergent, moisturized soil, saliva, urine, sweat...etc_x000D_The scale reads from 1 to 14:_x000D_1 - 3 indicates a very acidic substance_x000D_4 - 6 indicates an acidic substance_x000D_7 indicates neutral_x000D_8 - 11 indicates alkalinity_x000D_12 - 14 indicates a very high level of alkalinity_x000D_PH 1-14 color chart in each pack_x000D_The test strip color changes must be matched with the pH scale color chart within about 15 seconds_x000D_Paper Size: app 45mm x 7mm (L x W)_x000D_ _x000D_Instruction:_x000D_1.Simply press the testing strip to the object or liquid you are testing. Half second later, take out the paper and using the color chart included, compare the color change of the paper to find out the acidity level of your testing subject._x000D_2.Can not indicate the Acid or alkali solution when its density was lower than 0.01%._x000D_3.Keep dry for the rest paper._x000D_ _x000D_Package included:_x000D_1 * 80 Strips pH test paper 11.Simply press the testing strip to the object or liquid you are testing. Half second later, take out the paper and using the color chart included, compare the color change of the paper to find out the acidity level of your testing subject. 2Can not indicate the Acid or alkali solution when its density was lower than 0.01%. 3Keep dry for the rest paper. 4 5