Depending on the object being measured, measuring instruments can be categorized into various types, such as those for length, temperature, pressure, electrical parameters, and optical properties. Their core function is to provide accurate and reliable data to support decision-making, quality control, or scientific research.
They typically operate based on physical or chemical principles. For instance, thermometers utilize the principle of thermal expansion and contraction or the thermoelectric effect, while pressure sensors convert pressure signals using strain gauges or the piezoelectric effect. Modern measuring instruments often integrate electronic, computer, and communication technologies, enabling data acquisition, processing, and transmission, which significantly enhances measurement efficiency and precision.