Field instruments are tools used to measure and collect data in various environments, such as laboratories, construction sites, and natural settings. They help scientists, engineers, and technicians gather accurate information about physical properties, such as temperature, pressure, and humidity. Common examples include thermometers, barometers, and spectrometers. These instruments are designed for portability and ease of use, allowing professionals to conduct measurements directly in the field rather than in a controlled environment. This capability is essential for real-time data collection and analysis, which can inform decision-making and improve project outcomes in various industries, including environmental science and engineering.