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 , milk, liquid detergent, moisturized soil, saliva, urine, sweat...etc Original box: no Item size: 70*44*4mm and high . The scale reads from 1 to 14:1 - 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 PH 1-14 color chart in each pack. The test strip color changes must be matched with the pH scale color chart within about 15 seconds Paper Size:59mm x 8mm. 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. Can not indicate the Acid or solution when density lower than 0.01%. Keep dry for the rest paper ci fi cation: Original box: no. Net weight: 8g. Package Contents: 1 package pH test paper Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.