• gauge
• measurement
• measurement and control
• measuring instrument
• mechanical
• metrology
• metrology and quality control
• Optical Pyrometer
• Pyrometer
• Radiation Pyrometer
• temperature measurement

Optical Pyrometer: Working Principle, Diagram, Advantages, Temperature Measurement [Animation Video]

https://www.youtube.com/watch?v=8_Eq2qlFgzE