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 a second later, remove the paper and, using the color chart included, compare the color change of the paper to determine the acidity level of your test subject. 2. Cannot indicate the acid or alkali solution when its concentration is lower than 0.01%. 3. Keep the remaining papers dry. Specifications: Type: pH Test Strips Material: Paper Applications: Food, Urine, Lab, Soil, Body, Aquarium, Water Testing Features: pH Test Strips, Universal Litmus Paper, 1-14 Acidic Alkaline Indicator, Aquarium Water Tester Dimensions: approximately 5 x 7 cm / 1.97 x 2.76 in Color: As shown in picture Quantity: 1 Set Package Includes: 72 pcs x pH Test Strips Note: 1. Please allow 0-1 cm error due to manual measurement. Please ensure you are comfortable with this before purchasing. 2. Due to differences between monitor displays, the picture may not reflect the actual color of the item. Thank you!