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Explanation: misura di spettro, cioè è stato invertito in italiano. Vedi questo estratto:
The first, optical pyrometers (also known as brightness pyrometers) measure temperature in the visible light spectrum of 0.4 to 0.7 µm; specifically, 0.655 µm. The second, infrared thermometers, measure temperature in the infrared light spectrum of 0.7 to 80 µm (figure 1). The two groups use different technologies to measure temperature.
La traduzione esatta, secondo me, è spectrum band measurement...