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Is this a thermocouple thermometer?
No. According to the review at TheSweetHome.com (a New York Times-owned review site, sister site to the Wirecutter):
"The major technology difference between the Thermapen and its competitors has to do with its thermocouple sensor. The majority of instant-read thermometers (including the Javelin Pro Duo, our mid-level upgrade) use a thermistor, a small, relatively cheap-but-accurate resistor bundle stored in the tip of the probe. The Thermapen’s thermocouple has a thin sensor wire running down its whole probe, while keeping a more extensive set of reading and calibration electronics inside the sizable body. Because the wire has less mass than the thermistor nodule, it registers changes in temperature more quickly. That thin wire also allows for a thinner probe, helpful for thin fish filets and reducing the size of juice-releasing punctures."
However, the specs do say 2-3 seconds, same as the Thermapen. At any rate, My Sweet Home gives it a decent review.
No it's not, but we use an exclusive high-performance Japanese thermistor sensor which matches thermocouple's speed and accuracy at a lower cost.