Features: 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. 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 alkali solution when its density was lower than 0.01%. 3.Keep dry for the rest paper. Specifications: Type: pH Test Strips Material: Paper Applications: Food Urine Lab Soil Body Aquarium Water Test Features: pH Test Strips, Universal Litmus Paper, 1-14 Acidic Alkaline Indicator, Aquarium Water Tester Dimension: app.5x7cm/1.97x2.76in Color: As picture show Quantity: 1 Set Package Includes: 72 Pcs x pH Test Strips note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!