Instruction: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.2.Can not indicate the Acid or solution when its density was lower than 0.01%.3.Keep dry for the rest paperThere 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...etcThe scale reads from 1 to 14:1 - 3 indicates a very acidic substance4 - 6 indicates an acidic substance7 indicates neutral8 - 11 indicates alkalinity12 - 14 indicates a very high level of alkalinityPH 1-14 color chart in each packThe test strip color changes must be matched with the pH scale color chart within about 15 secondsPaper Size: app 45mm x 7mm (L x W)Material: papercolor: Photo ColorPackage Contents:3 set * 80 Strips pH test paperOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.