1. Barometer
  2. Energymeter
  3. Solarimeter
  4. Speedometer
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Answer: Option 3

The solarimeter measures routine global solar radiation on a plane or level surface. It has a thermocouple junction-sensing element. The sensing element is coated with a highly stable carbon based non organic coating, which delivers excellent spectral absorption and long-term stability characteristics. The sensing element is housed under two concentric fitting glass domes.

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