Oil Temperature Indicators (OTI) are essential instruments used in oil-filled power transformers to monitor and display the top oil temperature during operation. Accurate oil temperature measurement is critical for maintaining safe transformer performance and preventing overheating that can damage insulation and internal components. These indicators provide clear dial-type temperature indication along with adjustable alarm and trip contacts to activate cooling systems or protection mechanisms when temperature limits are exceeded. Widely used in substations, power plants, and industrial electri