Test instruments are tools used to measure, evaluate, or analyze various physical properties or conditions. They can include devices like multimeters, oscilloscopes, and thermometers, which help in assessing electrical, mechanical, or thermal characteristics. These instruments are essential in fields such as engineering, science, and medicine, ensuring accurate data collection and analysis. In addition to measuring, test instruments can also be used for calibration and quality control. For example, calibrators ensure that other instruments provide accurate readings. Proper use of test instruments is crucial for maintaining safety standards and improving the reliability of products and processes across various industries.