You can easily distinguish between a 2nd and 3rd generation Nest Learning Thermostat by examining the physical screen size and inspecting the device settings menu. The 3rd generation Nest features a noticeably larger 3.25-inch high-resolution display screen (spanning roughly a 40% larger viewing area) and includes Farsight technology, whereas the 2nd generation features a smaller 1.8-inch screen. Alternatively, you can check the exact generation details by opening your mobile app or navigating directly to Settings > Technical Info > Version on the physical thermostat display. Verification: Check the screen diameter or technical menu version info to confirm whether your unit is a 2nd or 3rd generation model.
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