Testing strips are small, thin pieces of material used to measure specific substances in liquids, commonly found in medical and home testing applications. They often change color to indicate the presence or concentration of a particular substance, such as glucose in blood for diabetes management or pH levels in swimming pools. These strips are designed for ease of use, allowing individuals to perform tests quickly and accurately. Users typically dip the strip into a sample, wait for a designated time, and then compare the resulting color to a chart provided with the strips to interpret the results.