pH test strips are simple tools used to measure the acidity or alkalinity of a solution. They are typically made of paper or plastic that has been treated with a chemical indicator. When dipped into a liquid, the strip changes color based on the pH level, which can range from 0 (very acidic) to 14 (very alkaline), with 7 being neutral. These strips are commonly used in various fields, including gardening, aquarium maintenance, and laboratories. They provide a quick and easy way to assess pH levels without the need for complex equipment, making them accessible for both professionals and hobbyists.