Answer: An optical instrument
Notes: Recently, a scintillometer was installed at the Tamil Nadu Rice Research Institute (TRRI) in Aduthurai, Tamil Nadu. It is an optical instrument used to measure heat and moisture exchange between the land surface and the atmosphere. The device transmits a light beam between two fixed points to collect data. Turbulent air causes minute fluctuations in the beam, called scintillations, which are analysed to estimate heat transfer. It was installed as part of the TRRI Critical Zone Observatory (CZO) to enhance climate and crop research.
