Which one of the following thermometers is known as pyrometer? निम्नलिखित तापमापियों में से किसे पायरोमीटर कहा जाता है?

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Which one of the following thermometers is known as pyrometer? निम्नलिखित तापमापियों में से किसे पायरोमीटर कहा जाता है?