Classification of temperature measurement instruments used for temperature control and quality management in manufacturing sites. Includes contact-type thermometers (rod thermometers, bimetallic thermometers, thermocouple thermometers), non-contact thermometers (radiation thermometers, infrared thermometers), digital thermometers, and recording thermometers. Essential for temperature monitoring of processing machinery, heat treatment management during metal processing, temperature control in resin molding, temperature verification in welding operations, and quality control in inspection processes. Clearly distinguished from other measuring instruments such as pressure gauges and flow meters, these are dedicated devices that measure temperature only.